Onimusha Blade Warriors - Platform: Playstation 1

Secret Characters: 
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Clear the game with certain normal characters will unlock 
other secret characters in the game. 
(Once you unlock them, you have to fight in VS Mode and 
these characters will join in the battle. You then need 
to defeat them)

Alternative Way - Gogandantess:
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Clear the game with all 12 normal characters in story mode 
to unlock him. 

Gogandantess:
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Have Samanosuke Akechi, Kaede, Normal Soldier and Kotarou each 
fight against Gogandantess to unlock him. 

Jujudormah:
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Ran Clear the game with Jujudormah twice in story mode.