Someone with a complex, hard-to-deal-with personality.
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A difficult, complicated, or notably unusual person.
When you call someone a piece of work, you usually mean they are particularly hard to deal with.
It's informal and typically said with frustration, though occasionally used humorously.
"A Character"
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Someone memorable and colorful, usually described with affection not frustration
"A Handful"
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Someone demanding or energetic, usually without the negative edge
"A Piece of Work"
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A notably difficult or complicated person, usually said with frustration