ちゅうしんじんぶつ

中心人物
leader
central personage

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ちゅうしんじんぶつ【中心人物】

the central [key] figure; the leading [guiding] spirit; the leader; the brain(s) 《behind…》; the ringleader 《of a riot [mutiny]》; the kingpin.

●…の中心人物 the key figure in sth

・公金流用事件の中心人物 the key figure in a scandal surrounding the misuse of public funds.