(All unverified).

VS Mode - Clear story mode.

Arcade Mode - Clear VS mode (single player).

Zatch's Diary - Clear story mode.

Minigames - Clear Zatch Diary Mode.

4 player Mode - Clear VS mode (single player).

Zatch - Default
Kanchome - Default
Tia - Default
Ponygon (VS mode) - Vulcan 300, ponygon, zatch, tia, naomi, naomi, zatch, vulcan 300.
Ponygon (Arcade mode) - tai, suzy, suzy, kanchome, zatch, zatch, zatch, ponygon. Note - go to password/options mode and click the faces in the order presented.
Wonrei - Default
Kido - Clear conditions with a B or higher on the second battle in story mode.
Reycom - Clear conditions with a B or higher on the second battle with the character in story mode.
Sugino - Clear conditions with a B or higher on the second battle with the character in story mode.
Kolulu - Clear conditions with a B or higher on the second battle with the character in story mode.
Fein - Clear conditions with a B or higher on the second battle with the character in story mode.
Eshros - Clear conditions with a B or higher on the second battle with the character in story mode.
Robnos 2 - Clear conditions with a B or higher on the second battle with the character in story mode. Note - To unlock him, destroy an object and make the debris hit Robnos and leave a metal bar in his head. Do not blast him with a zaker spell unless he has the metal bar in his head.
Maruss - Clear conditions with a B or higher on the second battle with the character in story mode.
Brago - Clear conditions with a B or higher on the second battle with the character in story mode.
Rops - Clear conditions with a B or higher on the second battle with the character in story mode.
Baransah - Clear conditions with a B or higher on the second battle with the character in story mode.
Bari - Clear conditions with a B or higher on the second battle with the character in story mode.
Victoriem (VS mode) - tia, tia, tia, suzy, tia, suzy, suzy, suzy.
Zeno (VS mode) - brago, brago,zatch, brago, zatch, brago, brago, brago.
Hyde (VS mode) - zatch, zatch, zatch, zatch, zatch, ponygon, zatch, zatch. Arcade mode)suzy, suzy, suzy, tai, suzy, tia, tia, tia.
Volcan 300 (minigame) - vulcan 300, zatch, tia, zatch, zatch, tia, zatch, vulcan 300.
Naomi (gallery only) - naomi, zatch, naomi, zatch, naomi, zatch, naomi, vulcan 300.
Suzy (gallery only) - zatch, tia, kanchome, suzy, suzy, vulcan 300, naomi, ponygon