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Accel
Available in Power Stone Collection only.
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Aya
From The Oneechanbara series
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Cornfed
S-Rank boss, playable upon defeat.
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Katze
Sub-boss in Story Mode, unlocked by defeating 100 enemies in Slash Mode.
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Miss April Fool's Day
AKA: Miss Goldenweek
Initially exclusive to Nico Robin, later unlockable for all characters.
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Rusty
From Steamworld series
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