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All answers having "Bad guy" as clue:

3 Character Answers:

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CAD

CUR

FOE

RAT



4 Character Answers:

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OGRE

PERP



5 Character Answers:

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ENEMY

HEAVY

MENIE

NASTY

SATAN



6 Character Answers:

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BANDIT

MEANIE

ROBBER



7 Character Answers:

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RUSTLER

VILLAIN



8 Character Answers:

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EVILDOER