The King of Fighters EX - Platform: Gameboy Advance

Unlock Geese:
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Beat the game with the Fatal Fury team and Geese will be unlocked. 

Unlock Iori:
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Beat the game with the Hero Team and Iori will be unlocked. 

Extra Strikers:
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Successfully complete the game with any team to unlock K', 
Maxima and Vanessa at the bottom of the character selection screen. 

Alternate costumes:
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When selecting a character, press L (clone costume of your enemy 
if you are fighting yourself) or R (different costume).