diff --git a/horse/character.kk b/horse/character.kk
new file mode 100644
index 0000000..592c385
--- /dev/null
+++ b/horse/character.kk
@@ -0,0 +1,17 @@
+module horse/character
+
+import horse/game-id
+
+pub struct character-detail
+  character-id: character-id
+  name: string
+
+pub fun detail(
+  c: character-id,
+  ?character/show: (character-id) -> string
+): character-detail
+  Character-detail(c, c.show)
+
+pub fun character-detail/show(d: character-detail): string
+  val Character-detail(Character-id(id), name) = d
+  name ++ " (ID " ++ id.show ++ ")"
diff --git a/horse/global/character.kk b/horse/global/character.kk
index f47d3cc..0e3d37a 100644
--- a/horse/global/character.kk
+++ b/horse/global/character.kk
@@ -4,537 +4,176 @@ module horse/global/character
 
 import std/core/vector
 import std/core-extras
+import std/data/rb-map
+import horse/game-id
+pub import horse/character
 
-// Character identity.
-pub type character
-  Special-Week
-  Silence-Suzuka
-  Tokai-Teio
-  Maruzensky
-  Fuji-Kiseki
-  Oguri-Cap
-  Gold-Ship
-  Vodka
-  Daiwa-Scarlet
-  Taiki-Shuttle
-  Grass-Wonder
-  Hishi-Amazon
-  Mejiro-McQueen
-  El-Condor-Pasa
-  TM-Opera-O
-  Narita-Brian
-  Symboli-Rudolf
-  Air-Groove
-  Agnes-Digital
-  Seiun-Sky
-  Tamamo-Cross
-  Fine-Motion
-  Biwa-Hayahide
-  Mayano-Top-Gun
-  Manhattan-Cafe
-  Mihono-Bourbon
-  Mejiro-Ryan
-  Hishi-Akebono
-  Rice-Shower
-  Agnes-Tachyon
-  Admire-Vega
-  Inari-One
-  Winning-Ticket
-  Eishin-Flash
-  Curren-Chan
-  Kawakami-Princess
-  Gold-City
-  Sakura-Bakushin-O
-  Sweep-Tosho
-  Super-Creek
-  Smart-Falcon
-  Tosen-Jordan
-  Narita-Taishin
-  Nishino-Flower
-  Haru-Urara
-  Matikanefukukitaru
-  Meisho-Doto
-  Mejiro-Dober
-  Nice-Nature
-  King-Halo
+val name2id: rbmap<string, character-id> = rb-map/empty()
+  .set("Special Week", Character-id(1001))
+  .set("Silence Suzuka", Character-id(1002))
+  .set("Tokai Teio", Character-id(1003))
+  .set("Maruzensky", Character-id(1004))
+  .set("Fuji Kiseki", Character-id(1005))
+  .set("Oguri Cap", Character-id(1006))
+  .set("Gold Ship", Character-id(1007))
+  .set("Vodka", Character-id(1008))
+  .set("Daiwa Scarlet", Character-id(1009))
+  .set("Taiki Shuttle", Character-id(1010))
+  .set("Grass Wonder", Character-id(1011))
+  .set("Hishi Amazon", Character-id(1012))
+  .set("Mejiro McQueen", Character-id(1013))
+  .set("El Condor Pasa", Character-id(1014))
+  .set("T.M. Opera O", Character-id(1015))
+  .set("Narita Brian", Character-id(1016))
+  .set("Symboli Rudolf", Character-id(1017))
+  .set("Air Groove", Character-id(1018))
+  .set("Agnes Digital", Character-id(1019))
+  .set("Seiun Sky", Character-id(1020))
+  .set("Tamamo Cross", Character-id(1021))
+  .set("Fine Motion", Character-id(1022))
+  .set("Biwa Hayahide", Character-id(1023))
+  .set("Mayano Top Gun", Character-id(1024))
+  .set("Manhattan Cafe", Character-id(1025))
+  .set("Mihono Bourbon", Character-id(1026))
+  .set("Mejiro Ryan", Character-id(1027))
+  .set("Hishi Akebono", Character-id(1028))
+  .set("Rice Shower", Character-id(1030))
+  .set("Agnes Tachyon", Character-id(1032))
+  .set("Admire Vega", Character-id(1033))
+  .set("Inari One", Character-id(1034))
+  .set("Winning Ticket", Character-id(1035))
+  .set("Eishin Flash", Character-id(1037))
+  .set("Curren Chan", Character-id(1038))
+  .set("Kawakami Princess", Character-id(1039))
+  .set("Gold City", Character-id(1040))
+  .set("Sakura Bakushin O", Character-id(1041))
+  .set("Sweep Tosho", Character-id(1044))
+  .set("Super Creek", Character-id(1045))
+  .set("Smart Falcon", Character-id(1046))
+  .set("Tosen Jordan", Character-id(1048))
+  .set("Narita Taishin", Character-id(1050))
+  .set("Nishino Flower", Character-id(1051))
+  .set("Haru Urara", Character-id(1052))
+  .set("Matikanefukukitaru", Character-id(1056))
+  .set("Meisho Doto", Character-id(1058))
+  .set("Mejiro Dober", Character-id(1059))
+  .set("Nice Nature", Character-id(1060))
+  .set("King Halo", Character-id(1061))
 
-// The list of all characters in order by ID, for easy iterating.
-pub val character/all = [
-  Special-Week,
-  Silence-Suzuka,
-  Tokai-Teio,
-  Maruzensky,
-  Fuji-Kiseki,
-  Oguri-Cap,
-  Gold-Ship,
-  Vodka,
-  Daiwa-Scarlet,
-  Taiki-Shuttle,
-  Grass-Wonder,
-  Hishi-Amazon,
-  Mejiro-McQueen,
-  El-Condor-Pasa,
-  TM-Opera-O,
-  Narita-Brian,
-  Symboli-Rudolf,
-  Air-Groove,
-  Agnes-Digital,
-  Seiun-Sky,
-  Tamamo-Cross,
-  Fine-Motion,
-  Biwa-Hayahide,
-  Mayano-Top-Gun,
-  Manhattan-Cafe,
-  Mihono-Bourbon,
-  Mejiro-Ryan,
-  Hishi-Akebono,
-  Rice-Shower,
-  Agnes-Tachyon,
-  Admire-Vega,
-  Inari-One,
-  Winning-Ticket,
-  Eishin-Flash,
-  Curren-Chan,
-  Kawakami-Princess,
-  Gold-City,
-  Sakura-Bakushin-O,
-  Sweep-Tosho,
-  Super-Creek,
-  Smart-Falcon,
-  Tosen-Jordan,
-  Narita-Taishin,
-  Nishino-Flower,
-  Haru-Urara,
-  Matikanefukukitaru,
-  Meisho-Doto,
-  Mejiro-Dober,
-  Nice-Nature,
-  King-Halo,
-]
+// Get the character ID that has the given exact name.
+// If no character matches the name, the result is an invalid ID.
+pub fun from-name(name: string): character-id
+  name2id.lookup(name).default(Character-id(0))
 
-// Get the character for a character ID.
-// Generally, these are four digit numbers in the range 1000-1999.
-pub fun character/from-id(id: int): maybe<character>
-  match id
-    1001 -> Just(Special-Week)
-    1002 -> Just(Silence-Suzuka)
-    1003 -> Just(Tokai-Teio)
-    1004 -> Just(Maruzensky)
-    1005 -> Just(Fuji-Kiseki)
-    1006 -> Just(Oguri-Cap)
-    1007 -> Just(Gold-Ship)
-    1008 -> Just(Vodka)
-    1009 -> Just(Daiwa-Scarlet)
-    1010 -> Just(Taiki-Shuttle)
-    1011 -> Just(Grass-Wonder)
-    1012 -> Just(Hishi-Amazon)
-    1013 -> Just(Mejiro-McQueen)
-    1014 -> Just(El-Condor-Pasa)
-    1015 -> Just(TM-Opera-O)
-    1016 -> Just(Narita-Brian)
-    1017 -> Just(Symboli-Rudolf)
-    1018 -> Just(Air-Groove)
-    1019 -> Just(Agnes-Digital)
-    1020 -> Just(Seiun-Sky)
-    1021 -> Just(Tamamo-Cross)
-    1022 -> Just(Fine-Motion)
-    1023 -> Just(Biwa-Hayahide)
-    1024 -> Just(Mayano-Top-Gun)
-    1025 -> Just(Manhattan-Cafe)
-    1026 -> Just(Mihono-Bourbon)
-    1027 -> Just(Mejiro-Ryan)
-    1028 -> Just(Hishi-Akebono)
-    1030 -> Just(Rice-Shower)
-    1032 -> Just(Agnes-Tachyon)
-    1033 -> Just(Admire-Vega)
-    1034 -> Just(Inari-One)
-    1035 -> Just(Winning-Ticket)
-    1037 -> Just(Eishin-Flash)
-    1038 -> Just(Curren-Chan)
-    1039 -> Just(Kawakami-Princess)
-    1040 -> Just(Gold-City)
-    1041 -> Just(Sakura-Bakushin-O)
-    1044 -> Just(Sweep-Tosho)
-    1045 -> Just(Super-Creek)
-    1046 -> Just(Smart-Falcon)
-    1048 -> Just(Tosen-Jordan)
-    1050 -> Just(Narita-Taishin)
-    1051 -> Just(Nishino-Flower)
-    1052 -> Just(Haru-Urara)
-    1056 -> Just(Matikanefukukitaru)
-    1058 -> Just(Meisho-Doto)
-    1059 -> Just(Mejiro-Dober)
-    1060 -> Just(Nice-Nature)
-    1061 -> Just(King-Halo)
-    _ -> Nothing
+// Get the name for a character.
+// If no character matches the ID, the result is the numeric ID.
+pub fun show(c: character-id): string
+  match c.game-id
+    1001 -> "Special Week"
+    1002 -> "Silence Suzuka"
+    1003 -> "Tokai Teio"
+    1004 -> "Maruzensky"
+    1005 -> "Fuji Kiseki"
+    1006 -> "Oguri Cap"
+    1007 -> "Gold Ship"
+    1008 -> "Vodka"
+    1009 -> "Daiwa Scarlet"
+    1010 -> "Taiki Shuttle"
+    1011 -> "Grass Wonder"
+    1012 -> "Hishi Amazon"
+    1013 -> "Mejiro McQueen"
+    1014 -> "El Condor Pasa"
+    1015 -> "T.M. Opera O"
+    1016 -> "Narita Brian"
+    1017 -> "Symboli Rudolf"
+    1018 -> "Air Groove"
+    1019 -> "Agnes Digital"
+    1020 -> "Seiun Sky"
+    1021 -> "Tamamo Cross"
+    1022 -> "Fine Motion"
+    1023 -> "Biwa Hayahide"
+    1024 -> "Mayano Top Gun"
+    1025 -> "Manhattan Cafe"
+    1026 -> "Mihono Bourbon"
+    1027 -> "Mejiro Ryan"
+    1028 -> "Hishi Akebono"
+    1030 -> "Rice Shower"
+    1032 -> "Agnes Tachyon"
+    1033 -> "Admire Vega"
+    1034 -> "Inari One"
+    1035 -> "Winning Ticket"
+    1037 -> "Eishin Flash"
+    1038 -> "Curren Chan"
+    1039 -> "Kawakami Princess"
+    1040 -> "Gold City"
+    1041 -> "Sakura Bakushin O"
+    1044 -> "Sweep Tosho"
+    1045 -> "Super Creek"
+    1046 -> "Smart Falcon"
+    1048 -> "Tosen Jordan"
+    1050 -> "Narita Taishin"
+    1051 -> "Nishino Flower"
+    1052 -> "Haru Urara"
+    1056 -> "Matikanefukukitaru"
+    1058 -> "Meisho Doto"
+    1059 -> "Mejiro Dober"
+    1060 -> "Nice Nature"
+    1061 -> "King Halo"
+    x -> "character " ++ x.show
 
-// Get the ID for a character.
-pub fun character/character-id(c: character): int
-  match c
-    Special-Week -> 1001
-    Silence-Suzuka -> 1002
-    Tokai-Teio -> 1003
-    Maruzensky -> 1004
-    Fuji-Kiseki -> 1005
-    Oguri-Cap -> 1006
-    Gold-Ship -> 1007
-    Vodka -> 1008
-    Daiwa-Scarlet -> 1009
-    Taiki-Shuttle -> 1010
-    Grass-Wonder -> 1011
-    Hishi-Amazon -> 1012
-    Mejiro-McQueen -> 1013
-    El-Condor-Pasa -> 1014
-    TM-Opera-O -> 1015
-    Narita-Brian -> 1016
-    Symboli-Rudolf -> 1017
-    Air-Groove -> 1018
-    Agnes-Digital -> 1019
-    Seiun-Sky -> 1020
-    Tamamo-Cross -> 1021
-    Fine-Motion -> 1022
-    Biwa-Hayahide -> 1023
-    Mayano-Top-Gun -> 1024
-    Manhattan-Cafe -> 1025
-    Mihono-Bourbon -> 1026
-    Mejiro-Ryan -> 1027
-    Hishi-Akebono -> 1028
-    Rice-Shower -> 1030
-    Agnes-Tachyon -> 1032
-    Admire-Vega -> 1033
-    Inari-One -> 1034
-    Winning-Ticket -> 1035
-    Eishin-Flash -> 1037
-    Curren-Chan -> 1038
-    Kawakami-Princess -> 1039
-    Gold-City -> 1040
-    Sakura-Bakushin-O -> 1041
-    Sweep-Tosho -> 1044
-    Super-Creek -> 1045
-    Smart-Falcon -> 1046
-    Tosen-Jordan -> 1048
-    Narita-Taishin -> 1050
-    Nishino-Flower -> 1051
-    Haru-Urara -> 1052
-    Matikanefukukitaru -> 1056
-    Meisho-Doto -> 1058
-    Mejiro-Dober -> 1059
-    Nice-Nature -> 1060
-    King-Halo -> 1061
-
-// Get the name of a character.
-pub fun character/show(c: character): string
-  match c
-    Special-Week -> "Special Week"
-    Silence-Suzuka -> "Silence Suzuka"
-    Tokai-Teio -> "Tokai Teio"
-    Maruzensky -> "Maruzensky"
-    Fuji-Kiseki -> "Fuji Kiseki"
-    Oguri-Cap -> "Oguri Cap"
-    Gold-Ship -> "Gold Ship"
-    Vodka -> "Vodka"
-    Daiwa-Scarlet -> "Daiwa Scarlet"
-    Taiki-Shuttle -> "Taiki Shuttle"
-    Grass-Wonder -> "Grass Wonder"
-    Hishi-Amazon -> "Hishi Amazon"
-    Mejiro-McQueen -> "Mejiro McQueen"
-    El-Condor-Pasa -> "El Condor Pasa"
-    TM-Opera-O -> "T.M. Opera O"
-    Narita-Brian -> "Narita Brian"
-    Symboli-Rudolf -> "Symboli Rudolf"
-    Air-Groove -> "Air Groove"
-    Agnes-Digital -> "Agnes Digital"
-    Seiun-Sky -> "Seiun Sky"
-    Tamamo-Cross -> "Tamamo Cross"
-    Fine-Motion -> "Fine Motion"
-    Biwa-Hayahide -> "Biwa Hayahide"
-    Mayano-Top-Gun -> "Mayano Top Gun"
-    Manhattan-Cafe -> "Manhattan Cafe"
-    Mihono-Bourbon -> "Mihono Bourbon"
-    Mejiro-Ryan -> "Mejiro Ryan"
-    Hishi-Akebono -> "Hishi Akebono"
-    Rice-Shower -> "Rice Shower"
-    Agnes-Tachyon -> "Agnes Tachyon"
-    Admire-Vega -> "Admire Vega"
-    Inari-One -> "Inari One"
-    Winning-Ticket -> "Winning Ticket"
-    Eishin-Flash -> "Eishin Flash"
-    Curren-Chan -> "Curren Chan"
-    Kawakami-Princess -> "Kawakami Princess"
-    Gold-City -> "Gold City"
-    Sakura-Bakushin-O -> "Sakura Bakushin O"
-    Sweep-Tosho -> "Sweep Tosho"
-    Super-Creek -> "Super Creek"
-    Smart-Falcon -> "Smart Falcon"
-    Tosen-Jordan -> "Tosen Jordan"
-    Narita-Taishin -> "Narita Taishin"
-    Nishino-Flower -> "Nishino Flower"
-    Haru-Urara -> "Haru Urara"
-    Matikanefukukitaru -> "Matikanefukukitaru"
-    Meisho-Doto -> "Meisho Doto"
-    Mejiro-Dober -> "Mejiro Dober"
-    Nice-Nature -> "Nice Nature"
-    King-Halo -> "King Halo"
-
-// Compare two characters.
-pub fip fun character/order2(a: character, b: character): order2<character>
-  match (a, b)
-    (Special-Week, Special-Week) -> Eq2(Special-Week)
-    (Special-Week, b') -> Lt2(Special-Week, b')
-    (a', Special-Week) -> Gt2(Special-Week, a')
-    (Silence-Suzuka, Silence-Suzuka) -> Eq2(Silence-Suzuka)
-    (Silence-Suzuka, b') -> Lt2(Silence-Suzuka, b')
-    (a', Silence-Suzuka) -> Gt2(Silence-Suzuka, a')
-    (Tokai-Teio, Tokai-Teio) -> Eq2(Tokai-Teio)
-    (Tokai-Teio, b') -> Lt2(Tokai-Teio, b')
-    (a', Tokai-Teio) -> Gt2(Tokai-Teio, a')
-    (Maruzensky, Maruzensky) -> Eq2(Maruzensky)
-    (Maruzensky, b') -> Lt2(Maruzensky, b')
-    (a', Maruzensky) -> Gt2(Maruzensky, a')
-    (Fuji-Kiseki, Fuji-Kiseki) -> Eq2(Fuji-Kiseki)
-    (Fuji-Kiseki, b') -> Lt2(Fuji-Kiseki, b')
-    (a', Fuji-Kiseki) -> Gt2(Fuji-Kiseki, a')
-    (Oguri-Cap, Oguri-Cap) -> Eq2(Oguri-Cap)
-    (Oguri-Cap, b') -> Lt2(Oguri-Cap, b')
-    (a', Oguri-Cap) -> Gt2(Oguri-Cap, a')
-    (Gold-Ship, Gold-Ship) -> Eq2(Gold-Ship)
-    (Gold-Ship, b') -> Lt2(Gold-Ship, b')
-    (a', Gold-Ship) -> Gt2(Gold-Ship, a')
-    (Vodka, Vodka) -> Eq2(Vodka)
-    (Vodka, b') -> Lt2(Vodka, b')
-    (a', Vodka) -> Gt2(Vodka, a')
-    (Daiwa-Scarlet, Daiwa-Scarlet) -> Eq2(Daiwa-Scarlet)
-    (Daiwa-Scarlet, b') -> Lt2(Daiwa-Scarlet, b')
-    (a', Daiwa-Scarlet) -> Gt2(Daiwa-Scarlet, a')
-    (Taiki-Shuttle, Taiki-Shuttle) -> Eq2(Taiki-Shuttle)
-    (Taiki-Shuttle, b') -> Lt2(Taiki-Shuttle, b')
-    (a', Taiki-Shuttle) -> Gt2(Taiki-Shuttle, a')
-    (Grass-Wonder, Grass-Wonder) -> Eq2(Grass-Wonder)
-    (Grass-Wonder, b') -> Lt2(Grass-Wonder, b')
-    (a', Grass-Wonder) -> Gt2(Grass-Wonder, a')
-    (Hishi-Amazon, Hishi-Amazon) -> Eq2(Hishi-Amazon)
-    (Hishi-Amazon, b') -> Lt2(Hishi-Amazon, b')
-    (a', Hishi-Amazon) -> Gt2(Hishi-Amazon, a')
-    (Mejiro-McQueen, Mejiro-McQueen) -> Eq2(Mejiro-McQueen)
-    (Mejiro-McQueen, b') -> Lt2(Mejiro-McQueen, b')
-    (a', Mejiro-McQueen) -> Gt2(Mejiro-McQueen, a')
-    (El-Condor-Pasa, El-Condor-Pasa) -> Eq2(El-Condor-Pasa)
-    (El-Condor-Pasa, b') -> Lt2(El-Condor-Pasa, b')
-    (a', El-Condor-Pasa) -> Gt2(El-Condor-Pasa, a')
-    (TM-Opera-O, TM-Opera-O) -> Eq2(TM-Opera-O)
-    (TM-Opera-O, b') -> Lt2(TM-Opera-O, b')
-    (a', TM-Opera-O) -> Gt2(TM-Opera-O, a')
-    (Narita-Brian, Narita-Brian) -> Eq2(Narita-Brian)
-    (Narita-Brian, b') -> Lt2(Narita-Brian, b')
-    (a', Narita-Brian) -> Gt2(Narita-Brian, a')
-    (Symboli-Rudolf, Symboli-Rudolf) -> Eq2(Symboli-Rudolf)
-    (Symboli-Rudolf, b') -> Lt2(Symboli-Rudolf, b')
-    (a', Symboli-Rudolf) -> Gt2(Symboli-Rudolf, a')
-    (Air-Groove, Air-Groove) -> Eq2(Air-Groove)
-    (Air-Groove, b') -> Lt2(Air-Groove, b')
-    (a', Air-Groove) -> Gt2(Air-Groove, a')
-    (Agnes-Digital, Agnes-Digital) -> Eq2(Agnes-Digital)
-    (Agnes-Digital, b') -> Lt2(Agnes-Digital, b')
-    (a', Agnes-Digital) -> Gt2(Agnes-Digital, a')
-    (Seiun-Sky, Seiun-Sky) -> Eq2(Seiun-Sky)
-    (Seiun-Sky, b') -> Lt2(Seiun-Sky, b')
-    (a', Seiun-Sky) -> Gt2(Seiun-Sky, a')
-    (Tamamo-Cross, Tamamo-Cross) -> Eq2(Tamamo-Cross)
-    (Tamamo-Cross, b') -> Lt2(Tamamo-Cross, b')
-    (a', Tamamo-Cross) -> Gt2(Tamamo-Cross, a')
-    (Fine-Motion, Fine-Motion) -> Eq2(Fine-Motion)
-    (Fine-Motion, b') -> Lt2(Fine-Motion, b')
-    (a', Fine-Motion) -> Gt2(Fine-Motion, a')
-    (Biwa-Hayahide, Biwa-Hayahide) -> Eq2(Biwa-Hayahide)
-    (Biwa-Hayahide, b') -> Lt2(Biwa-Hayahide, b')
-    (a', Biwa-Hayahide) -> Gt2(Biwa-Hayahide, a')
-    (Mayano-Top-Gun, Mayano-Top-Gun) -> Eq2(Mayano-Top-Gun)
-    (Mayano-Top-Gun, b') -> Lt2(Mayano-Top-Gun, b')
-    (a', Mayano-Top-Gun) -> Gt2(Mayano-Top-Gun, a')
-    (Manhattan-Cafe, Manhattan-Cafe) -> Eq2(Manhattan-Cafe)
-    (Manhattan-Cafe, b') -> Lt2(Manhattan-Cafe, b')
-    (a', Manhattan-Cafe) -> Gt2(Manhattan-Cafe, a')
-    (Mihono-Bourbon, Mihono-Bourbon) -> Eq2(Mihono-Bourbon)
-    (Mihono-Bourbon, b') -> Lt2(Mihono-Bourbon, b')
-    (a', Mihono-Bourbon) -> Gt2(Mihono-Bourbon, a')
-    (Mejiro-Ryan, Mejiro-Ryan) -> Eq2(Mejiro-Ryan)
-    (Mejiro-Ryan, b') -> Lt2(Mejiro-Ryan, b')
-    (a', Mejiro-Ryan) -> Gt2(Mejiro-Ryan, a')
-    (Hishi-Akebono, Hishi-Akebono) -> Eq2(Hishi-Akebono)
-    (Hishi-Akebono, b') -> Lt2(Hishi-Akebono, b')
-    (a', Hishi-Akebono) -> Gt2(Hishi-Akebono, a')
-    (Rice-Shower, Rice-Shower) -> Eq2(Rice-Shower)
-    (Rice-Shower, b') -> Lt2(Rice-Shower, b')
-    (a', Rice-Shower) -> Gt2(Rice-Shower, a')
-    (Agnes-Tachyon, Agnes-Tachyon) -> Eq2(Agnes-Tachyon)
-    (Agnes-Tachyon, b') -> Lt2(Agnes-Tachyon, b')
-    (a', Agnes-Tachyon) -> Gt2(Agnes-Tachyon, a')
-    (Admire-Vega, Admire-Vega) -> Eq2(Admire-Vega)
-    (Admire-Vega, b') -> Lt2(Admire-Vega, b')
-    (a', Admire-Vega) -> Gt2(Admire-Vega, a')
-    (Inari-One, Inari-One) -> Eq2(Inari-One)
-    (Inari-One, b') -> Lt2(Inari-One, b')
-    (a', Inari-One) -> Gt2(Inari-One, a')
-    (Winning-Ticket, Winning-Ticket) -> Eq2(Winning-Ticket)
-    (Winning-Ticket, b') -> Lt2(Winning-Ticket, b')
-    (a', Winning-Ticket) -> Gt2(Winning-Ticket, a')
-    (Eishin-Flash, Eishin-Flash) -> Eq2(Eishin-Flash)
-    (Eishin-Flash, b') -> Lt2(Eishin-Flash, b')
-    (a', Eishin-Flash) -> Gt2(Eishin-Flash, a')
-    (Curren-Chan, Curren-Chan) -> Eq2(Curren-Chan)
-    (Curren-Chan, b') -> Lt2(Curren-Chan, b')
-    (a', Curren-Chan) -> Gt2(Curren-Chan, a')
-    (Kawakami-Princess, Kawakami-Princess) -> Eq2(Kawakami-Princess)
-    (Kawakami-Princess, b') -> Lt2(Kawakami-Princess, b')
-    (a', Kawakami-Princess) -> Gt2(Kawakami-Princess, a')
-    (Gold-City, Gold-City) -> Eq2(Gold-City)
-    (Gold-City, b') -> Lt2(Gold-City, b')
-    (a', Gold-City) -> Gt2(Gold-City, a')
-    (Sakura-Bakushin-O, Sakura-Bakushin-O) -> Eq2(Sakura-Bakushin-O)
-    (Sakura-Bakushin-O, b') -> Lt2(Sakura-Bakushin-O, b')
-    (a', Sakura-Bakushin-O) -> Gt2(Sakura-Bakushin-O, a')
-    (Sweep-Tosho, Sweep-Tosho) -> Eq2(Sweep-Tosho)
-    (Sweep-Tosho, b') -> Lt2(Sweep-Tosho, b')
-    (a', Sweep-Tosho) -> Gt2(Sweep-Tosho, a')
-    (Super-Creek, Super-Creek) -> Eq2(Super-Creek)
-    (Super-Creek, b') -> Lt2(Super-Creek, b')
-    (a', Super-Creek) -> Gt2(Super-Creek, a')
-    (Smart-Falcon, Smart-Falcon) -> Eq2(Smart-Falcon)
-    (Smart-Falcon, b') -> Lt2(Smart-Falcon, b')
-    (a', Smart-Falcon) -> Gt2(Smart-Falcon, a')
-    (Tosen-Jordan, Tosen-Jordan) -> Eq2(Tosen-Jordan)
-    (Tosen-Jordan, b') -> Lt2(Tosen-Jordan, b')
-    (a', Tosen-Jordan) -> Gt2(Tosen-Jordan, a')
-    (Narita-Taishin, Narita-Taishin) -> Eq2(Narita-Taishin)
-    (Narita-Taishin, b') -> Lt2(Narita-Taishin, b')
-    (a', Narita-Taishin) -> Gt2(Narita-Taishin, a')
-    (Nishino-Flower, Nishino-Flower) -> Eq2(Nishino-Flower)
-    (Nishino-Flower, b') -> Lt2(Nishino-Flower, b')
-    (a', Nishino-Flower) -> Gt2(Nishino-Flower, a')
-    (Haru-Urara, Haru-Urara) -> Eq2(Haru-Urara)
-    (Haru-Urara, b') -> Lt2(Haru-Urara, b')
-    (a', Haru-Urara) -> Gt2(Haru-Urara, a')
-    (Matikanefukukitaru, Matikanefukukitaru) -> Eq2(Matikanefukukitaru)
-    (Matikanefukukitaru, b') -> Lt2(Matikanefukukitaru, b')
-    (a', Matikanefukukitaru) -> Gt2(Matikanefukukitaru, a')
-    (Meisho-Doto, Meisho-Doto) -> Eq2(Meisho-Doto)
-    (Meisho-Doto, b') -> Lt2(Meisho-Doto, b')
-    (a', Meisho-Doto) -> Gt2(Meisho-Doto, a')
-    (Mejiro-Dober, Mejiro-Dober) -> Eq2(Mejiro-Dober)
-    (Mejiro-Dober, b') -> Lt2(Mejiro-Dober, b')
-    (a', Mejiro-Dober) -> Gt2(Mejiro-Dober, a')
-    (Nice-Nature, Nice-Nature) -> Eq2(Nice-Nature)
-    (Nice-Nature, b') -> Lt2(Nice-Nature, b')
-    (a', Nice-Nature) -> Gt2(Nice-Nature, a')
-    (King-Halo, King-Halo) -> Eq2(King-Halo)
-
-// Character equality.
-pub fun character/(==)(a: character, b: character): bool
-  match (a, b)
-    (Special-Week, Special-Week) -> True
-    (Silence-Suzuka, Silence-Suzuka) -> True
-    (Tokai-Teio, Tokai-Teio) -> True
-    (Maruzensky, Maruzensky) -> True
-    (Fuji-Kiseki, Fuji-Kiseki) -> True
-    (Oguri-Cap, Oguri-Cap) -> True
-    (Gold-Ship, Gold-Ship) -> True
-    (Vodka, Vodka) -> True
-    (Daiwa-Scarlet, Daiwa-Scarlet) -> True
-    (Taiki-Shuttle, Taiki-Shuttle) -> True
-    (Grass-Wonder, Grass-Wonder) -> True
-    (Hishi-Amazon, Hishi-Amazon) -> True
-    (Mejiro-McQueen, Mejiro-McQueen) -> True
-    (El-Condor-Pasa, El-Condor-Pasa) -> True
-    (TM-Opera-O, TM-Opera-O) -> True
-    (Narita-Brian, Narita-Brian) -> True
-    (Symboli-Rudolf, Symboli-Rudolf) -> True
-    (Air-Groove, Air-Groove) -> True
-    (Agnes-Digital, Agnes-Digital) -> True
-    (Seiun-Sky, Seiun-Sky) -> True
-    (Tamamo-Cross, Tamamo-Cross) -> True
-    (Fine-Motion, Fine-Motion) -> True
-    (Biwa-Hayahide, Biwa-Hayahide) -> True
-    (Mayano-Top-Gun, Mayano-Top-Gun) -> True
-    (Manhattan-Cafe, Manhattan-Cafe) -> True
-    (Mihono-Bourbon, Mihono-Bourbon) -> True
-    (Mejiro-Ryan, Mejiro-Ryan) -> True
-    (Hishi-Akebono, Hishi-Akebono) -> True
-    (Rice-Shower, Rice-Shower) -> True
-    (Agnes-Tachyon, Agnes-Tachyon) -> True
-    (Admire-Vega, Admire-Vega) -> True
-    (Inari-One, Inari-One) -> True
-    (Winning-Ticket, Winning-Ticket) -> True
-    (Eishin-Flash, Eishin-Flash) -> True
-    (Curren-Chan, Curren-Chan) -> True
-    (Kawakami-Princess, Kawakami-Princess) -> True
-    (Gold-City, Gold-City) -> True
-    (Sakura-Bakushin-O, Sakura-Bakushin-O) -> True
-    (Sweep-Tosho, Sweep-Tosho) -> True
-    (Super-Creek, Super-Creek) -> True
-    (Smart-Falcon, Smart-Falcon) -> True
-    (Tosen-Jordan, Tosen-Jordan) -> True
-    (Narita-Taishin, Narita-Taishin) -> True
-    (Nishino-Flower, Nishino-Flower) -> True
-    (Haru-Urara, Haru-Urara) -> True
-    (Matikanefukukitaru, Matikanefukukitaru) -> True
-    (Meisho-Doto, Meisho-Doto) -> True
-    (Mejiro-Dober, Mejiro-Dober) -> True
-    (Nice-Nature, Nice-Nature) -> True
-    (King-Halo, King-Halo) -> True
-    _ -> False
-
-fip fun character/index(^c: character): int
-  match c
-    Special-Week -> 0
-    Silence-Suzuka -> 1
-    Tokai-Teio -> 2
-    Maruzensky -> 3
-    Fuji-Kiseki -> 4
-    Oguri-Cap -> 5
-    Gold-Ship -> 6
-    Vodka -> 7
-    Daiwa-Scarlet -> 8
-    Taiki-Shuttle -> 9
-    Grass-Wonder -> 10
-    Hishi-Amazon -> 11
-    Mejiro-McQueen -> 12
-    El-Condor-Pasa -> 13
-    TM-Opera-O -> 14
-    Narita-Brian -> 15
-    Symboli-Rudolf -> 16
-    Air-Groove -> 17
-    Agnes-Digital -> 18
-    Seiun-Sky -> 19
-    Tamamo-Cross -> 20
-    Fine-Motion -> 21
-    Biwa-Hayahide -> 22
-    Mayano-Top-Gun -> 23
-    Manhattan-Cafe -> 24
-    Mihono-Bourbon -> 25
-    Mejiro-Ryan -> 26
-    Hishi-Akebono -> 27
-    Rice-Shower -> 28
-    Agnes-Tachyon -> 29
-    Admire-Vega -> 30
-    Inari-One -> 31
-    Winning-Ticket -> 32
-    Eishin-Flash -> 33
-    Curren-Chan -> 34
-    Kawakami-Princess -> 35
-    Gold-City -> 36
-    Sakura-Bakushin-O -> 37
-    Sweep-Tosho -> 38
-    Super-Creek -> 39
-    Smart-Falcon -> 40
-    Tosen-Jordan -> 41
-    Narita-Taishin -> 42
-    Nishino-Flower -> 43
-    Haru-Urara -> 44
-    Matikanefukukitaru -> 45
-    Meisho-Doto -> 46
-    Mejiro-Dober -> 47
-    Nice-Nature -> 48
-    King-Halo -> 49
+fun character/index(c: character-id): int
+  match c.game-id
+    1001 -> 0
+    1002 -> 1
+    1003 -> 2
+    1004 -> 3
+    1005 -> 4
+    1006 -> 5
+    1007 -> 6
+    1008 -> 7
+    1009 -> 8
+    1010 -> 9
+    1011 -> 10
+    1012 -> 11
+    1013 -> 12
+    1014 -> 13
+    1015 -> 14
+    1016 -> 15
+    1017 -> 16
+    1018 -> 17
+    1019 -> 18
+    1020 -> 19
+    1021 -> 20
+    1022 -> 21
+    1023 -> 22
+    1024 -> 23
+    1025 -> 24
+    1026 -> 25
+    1027 -> 26
+    1028 -> 27
+    1030 -> 28
+    1032 -> 29
+    1033 -> 30
+    1034 -> 31
+    1035 -> 32
+    1037 -> 33
+    1038 -> 34
+    1039 -> 35
+    1040 -> 36
+    1041 -> 37
+    1044 -> 38
+    1045 -> 39
+    1046 -> 40
+    1048 -> 41
+    1050 -> 42
+    1051 -> 43
+    1052 -> 44
+    1056 -> 45
+    1058 -> 46
+    1059 -> 47
+    1060 -> 48
+    1061 -> 49
+    _ -> -99999999
 
 // Create the table of all pair affinities.
 // The affinity is the value at a.index*count + b.index.
@@ -544,7 +183,7 @@ extern global/create-pair-table(): vector<int>
 val global/pair-table = global/create-pair-table()
 
 // Base affinity between a pair using the global ruleset.
-pub fun global/pair-affinity(a: character, b: character): int
+pub fun global/pair-affinity(a: character-id, b: character-id): int
   global/pair-table.at(a.index * 50 + b.index).default(0)
 
 // Create the table of all trio affinities.
@@ -555,5 +194,5 @@ extern global/create-trio-table(): vector<int>
 val global/trio-table = global/create-trio-table()
 
 // Base affinity for a trio using the global ruleset.
-pub fun global/trio-affinity(a: character, b: character, c: character): int
+pub fun global/trio-affinity(a: character-id, b: character-id, c: character-id): int
   global/trio-table.at(a.index * 50 * 50 + b.index * 50 + c.index).default(0)
\ No newline at end of file
diff --git a/horse/global/skill.kk b/horse/global/skill.kk
index b94f31a..b7f4cd9 100644
--- a/horse/global/skill.kk
+++ b/horse/global/skill.kk
@@ -512,7 +512,7 @@ val name2id: rbmap<string, skill-id> = rb-map/empty()
 
 // Get the skill ID that has the given exact name.
 // Inherited skills have `" (Inherited)"` appended to their names.
-// If no skill matches the ID, the result is an invalid ID.
+// If no skill matches the name, the result is an invalid ID.
 pub fun from-name(name: string): skill-id
   name2id.lookup(name).default(Skill-id(0))
 
diff --git a/horsegen/character.kk.template b/horsegen/character.kk.template
index 4782eff..8782d8f 100644
--- a/horsegen/character.kk.template
+++ b/horsegen/character.kk.template
@@ -5,67 +5,35 @@ module horse/{{ $.Region }}/character
 
 import std/core/vector
 import std/core-extras
+import std/data/rb-map
+import horse/game-id
+pub import horse/character
 
-// Character identity.
-pub type character
+val name2id: rbmap<string, character-id> = rb-map/empty()
   {{- range $uma := $.Characters }}
-  {{ kkenum $uma.Name }}
+  .set({{ printf "%q" $uma.Name }}, Character-id({{ $uma.ID}}))
   {{- end }}
 
-// The list of all characters in order by ID, for easy iterating.
-pub val character/all = [
-  {{- range $uma := $.Characters }}
-  {{ kkenum $uma.Name }},
-  {{- end }}
-]
+// Get the character ID that has the given exact name.
+// If no character matches the name, the result is an invalid ID.
+pub fun from-name(name: string): character-id
+  name2id.lookup(name).default(Character-id(0))
 
-// Get the character for a character ID.
-// Generally, these are four digit numbers in the range 1000-1999.
-pub fun character/from-id(id: int): maybe<character>
-  match id
+// Get the name for a character.
+// If no character matches the ID, the result is the numeric ID.
+pub fun show(c: character-id): string
+  match c.game-id
     {{- range $uma := $.Characters }}
-    {{ $uma.ID }} -> Just( {{- kkenum $uma.Name -}} )
+    {{ $uma.ID }} -> {{ printf "%q" $uma.Name }}
     {{- end }}
-    _ -> Nothing
+    x -> "character " ++ x.show
 
-// Get the ID for a character.
-pub fun character/character-id(c: character): int
-  match c
+fun character/index(c: character-id): int
+  match c.game-id
     {{- range $uma := $.Characters }}
-    {{ kkenum $uma.Name }} -> {{ $uma.ID }}
-    {{- end }}
-
-// Get the name of a character.
-pub fun character/show(c: character): string
-  match c
-    {{- range $uma := $.Characters }}
-    {{ kkenum $uma.Name }} -> {{ printf "%q" $uma.Name }}
-    {{- end }}
-
-// Compare two characters.
-pub fip fun character/order2(a: character, b: character): order2<character>
-  match (a, b)
-    {{- range $uma := $.Characters }}{{ $e := kkenum $uma.Name }}
-    ( {{- $e }}, {{ $e -}} ) -> Eq2( {{- $e -}} )
-    {{- if ne $uma.ID $.MaxID }}
-    ( {{- $e }}, b') -> Lt2( {{- $e }}, b')
-    (a', {{ $e -}} ) -> Gt2( {{- $e }}, a')
-    {{- end }}
-    {{- end }}
-
-// Character equality.
-pub fun character/(==)(a: character, b: character): bool
-  match (a, b)
-    {{- range $uma := $.Characters }}{{ $e := kkenum $uma.Name }}
-    ( {{- $e }}, {{ $e -}} ) -> True
-    {{- end }}
-    _ -> False
-
-fip fun character/index(^c: character): int
-  match c
-    {{- range $uma := $.Characters }}
-    {{ kkenum $uma.Name }} -> {{ $uma.Index }}
+    {{ $uma.ID }} -> {{ $uma.Index }}
     {{- end }}
+    _ -> -99999999
 
 // Create the table of all pair affinities.
 // The affinity is the value at a.index*count + b.index.
@@ -87,7 +55,7 @@ extern global/create-pair-table(): vector<int>
 val global/pair-table = global/create-pair-table()
 
 // Base affinity between a pair using the global ruleset.
-pub fun global/pair-affinity(a: character, b: character): int
+pub fun global/pair-affinity(a: character-id, b: character-id): int
   global/pair-table.at(a.index * {{ $.Count }} + b.index).default(0)
 
 // Create the table of all trio affinities.
@@ -114,7 +82,7 @@ extern global/create-trio-table(): vector<int>
 val global/trio-table = global/create-trio-table()
 
 // Base affinity for a trio using the global ruleset.
-pub fun global/trio-affinity(a: character, b: character, c: character): int
+pub fun global/trio-affinity(a: character-id, b: character-id, c: character-id): int
   global/trio-table.at(a.index * {{ $.Count }} * {{ $.Count }} + b.index * {{ $.Count }} + c.index).default(0)
 
 {{- end }}
diff --git a/horsegen/skill.kk.template b/horsegen/skill.kk.template
index 601e88f..6db18b9 100644
--- a/horsegen/skill.kk.template
+++ b/horsegen/skill.kk.template
@@ -16,7 +16,7 @@ val name2id: rbmap<string, skill-id> = rb-map/empty()
 
 // Get the skill ID that has the given exact name.
 // Inherited skills have `" (Inherited)"` appended to their names.
-// If no skill matches the ID, the result is an invalid ID.
+// If no skill matches the name, the result is an invalid ID.
 pub fun from-name(name: string): skill-id
   name2id.lookup(name).default(Skill-id(0))