expression, noun
person inside a cartoon body suit
Refers to the performer wearing a mascot or character costume, especially at theme parks or events. Often used in fan discussions about who is inside a famous character suit.
ディズニーランドのミッキーの中の人は誰だろう。
I wonder who the person inside Mickey at Disneyland is.
expression, noun
voice actor (of a particular character)
By extension from the costume sense, used for the voice actor behind an animated character, especially in anime and game fan communities.
このアニメの主人公の中の人は新人声優らしい。
Apparently the voice actor for the main character of this anime is a newcomer.
expression, noun
insider; person on the inside
Slang for someone with inside knowledge or connections, often used in corporate, political, or online community contexts. Carries a slightly secretive or conspiratorial tone.
中の人の話だと、来月大きな発表があるらしい。
According to an insider, there's going to be a big announcement next month.
Formal term for insider; 中の人 is slangy and often used in online or pop-culture contexts.
Literally 'person inside'. Originated from fan discussions about who is inside mascot costumes, then extended to voice actors and insiders.