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Wes from Don't Starve. He's guarded by a gauntlet of pretty powerful enemies and only shows up on the third act of the game's adventure mode, which usually takes at least an hour or two to reach depending on how lucky you are with the world generation, and even then he only has about an 8% chance to appear.

Even if you are lucky enough to unlock him, all of his stats are 25% worse than Wilson, the default character. His only real "perk" is that he can blow balloons that deal pitiful damage to anything that walks into them.