If his name didn't tip you off, this is the crazed counterpart to Master Hand, often serving as a true final boss in the Super Smash Bros. games (starting with Melee) alongside his more sane brother.
His role in the universe is even less clear than Master Hand's, though it is stated that he is the destructive spirit to Master Hand's creative spirit. In Brawl, both are forcibly subordinated under Tabuu in the Subspace Emissary, though Crazy Hand makes no appearance in the mode proper, while in Ultimate, he is an unwilling subordinate of Dharkon in World of Light.
Whenever Master Hand transforms into Master Core, Crazy Hand teleports out of the battle. Instead, in 3DS and Wii U, he runs a side joint called Crazy Orders, where he bargains participants with rewards for increasing challenges and a final confrontation with him.
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