Zatch Bell! Electric Arena - Platform: Gameboy Advance

Unlock Character: Brago & Sherry:
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Beat them in the Story mode

Unlock Character: Kolulu & Lori:
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Beat them in the Story mode

Unlock Character: Kanchome & Folgore:
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Beat them in the Story mode

Unlock Character: Rops & Apolo:
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Beat them in the Story mode

Unlock Character: Tia & Megumi:
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Beat them in the Story mode

Unlock mode: Mini-game "Create a Volcan!!":
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Complete the game once

Unlock mode: VS Challenge:
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Complete the game once

Unlock mode: VS Survival:
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Complete the game once

Completion bonuses:
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Successfully complete the game to unlock the Create A Volcan mini-game, 
Vs. Challenge mode, and Vs. Survival mode.