One Piece Grand Adventure

Unlock Eneru (Crocodile's adventure mode):
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Get Eneru as your ally in the Jaya area and win a battle using him.

Unlock Mihawk (Chaser's adventure mode):
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After recruiting Mihawk win a battle using him.

Unlock Mr. 2 Bon Clay (Crocodile's adventure mode):
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Get Mr. 2 as your ally and win a battle using him.

Unlock Nico Robin (Luffy's adventure mode):
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Get her as your ally at the end and win a battle using her.

Unlock Ohm (Crocodile's adventure mode):
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Get Ohm as your ally in the Jaya area and win a battle using him.

Unlock Shanks (Buggy's adventure mode):
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Recruit Shanks and then win a battle using him.

Unlock Trace (Buggy's adventure mode):
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Recruit him in Drum Island then win a battle using him.