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Soitsu, Doitsu, Koitsu, and Aitsu are characters from the Parodius series. They are seen as little stick men flying on paper airplanes. They are also monsters in the Yu-Gi-Oh! trading card game whose full power cannot be utilized unless they're played in pairs.

Their names are commonly used in Japanese slang terms to refer to people one does not know:

  • Doitsu = who
  • Koitsu = this guy
  • Soitsu = that guy (far from the speaker but near to the listener)
  • Aitsu = that guy (far from both chatters)

Weapon set

Gokujō Parodius!

S: Speed Up

M: Homing Missile

D: Round Shot

L: Wave

O: Grade Up

?: Aura

Sexy Parodius

S: Speed Up

M: Strong Missile

D: Round Shot

L: Wave

O: Grade Up

?: Aura

Gokujō Parodius! ~ Kako no Eikō o Motomete ~
Characters Takosuke and BelialVic Viper and Lord BritishPentaro and HanakoTwinBee and WinBeeHikaru and AkaneMambo and SambaMichael and GabrielKoitsu and AitsuGoemon and EbisumaruDracula-kun and Kid DraculaUpa and RupaMr. Past Glory
Stages Circo Porto HarborlandCat Battleship ForeverCandy LandTraffic SignsCore Ship ParadeMoai BattleshipThe MoonDiscoShooting Memories
Bosses Anna PavlovaCat SubmarineElizaDecoration CoreCrazy CoreCapsule Monster CappuccinoYoshikoPrincess KaguyaChichibinta RikaTako's CutiePentaro X
Jikkyō Oshaberi Parodius
Characters Takohiko and BelialVic Viper and Lord BritishPentaro and HanakoTwinBee and WinBeeSue and MemimMike and RanSoitsu and DoitsuUpa and RupaDracula-kun and Kid DraculaMr. Past Glory
Stages Hip Hop DiscoSchoolDonburi FieldsEdoSweet LandHigh Speed PatrolFiesta BasePolygon Space (Omake 1) • Grand Prix (Omake 2)
Bosses Mirror BallJudyEnormous Hikaru and AkaneMardock's Battleship/Warumon's FlaghshipBaron BeeBoin BeeGoemon CompactDecoration Core MK IIKitty TrainBig Core MK I (SNES) • Ghost Woman (SNES) • Big Baron Bee (SNES) • John Wanjiro (PSX) • Penkuro (PSX) • Temple LordMr. Goldfish's Selling FortressChichibinta RikaBacteriyaRobot Wall
Sexy Parodius
Characters Vic Viper and Lord BritishIvan and TobyHikaru and AkaneMambo and SambaMichael and GabrielKoitsu and AitsuOption and MultipleShooting Star and Black Viper (Ace) • The Old Lecher Tako
Stages FarmBath HouseUnderwater PalaceCastle DraculaGirl FactoryCoal MineSweet SkyBoss RushTaj MahalSpecial Stage
Bosses Corn ChiwaFinally PenguinOtohimeMedusaTransporting CraneTanuko the TanukiCandy CoreCapsule Monster CappuccinoCaptain Penguinovski the 3rdEagle Eagle SabnosukeHot LipsYuko"Mon"KaoriSexy Star