comedian; comic actor
Originally from the Kabuki system where the third-ranking actor (三枚目) played comic roles. Now used broadly for any actor or entertainer specializing in comedy.
He is a popular comedian on comedy shows.
あの俳優はシリアスな役より三枚目の方が合っている。
That actor is better suited to comic roles than serious ones.
figure of fun; laughing stock
Used for a person who is often the butt of jokes or not taken seriously, often in a social or workplace context.
会議でまた失敗して、すっかり三枚目扱いだ。
I messed up again in the meeting and now I'm treated like a total laughing stock.