Go to the password screen and enter the following words/characters into the slots to unlock the following:

Effect - Password

Hyde in Arcade Mode
[Suzy] [Suzy] [Suzy] [Tia] [Suzy] [Tia] [Tia] [Tia]

Naomi Model in the Gallery
[Naomi] [Zatch] [Naomi] [Zatch] [Naomi] [Zatch] [Naomi] [Volcan 300]

Ponygon in Arcade Mode
[Tia] [Suzy] [Suzy] [Kanchome] [Zatch] [Zatch] [Zatch] [Ponygon]

Ponygon in VS. Mode
[Volcan 300] [Ponygon] [Zatch] [Tia] [Naomi] [Naomi] [Zatch] [Volcan 300]

Suzy Model in the Gallery
[Zatch] [Tia] [Kanchome] [Suzy] [Suzy] [Volcan 300] [Naomi] [Ponygon]

Unlock VS. Mode
[Tia] [Tia] [Tia] [Suzy] [Tia] [Suzy] [Suzy] [Suzy]

Victoream in VS. Mode
[Zatch] [Zatch] [Zatch] [Zatch] [Zatch] [Ponygon] [Zatch] [Zatch]

Volcan 300 Mini Game
[Volcan 300] [Zatch] [Tia] [Zatch] [Zatch] [Tia] [Zatch] [Volcan 300]

Zeno in VS. Mode
[Brago] [Brago] [Zatch] [Brago] [Zatch] [Brago] [Brago] [Brago]