also: サブキャラ
noun
minor character; supporting character
Refers to a character in a story, game, or anime who is not the main protagonist. Often used in discussions of fiction, games, and media. The term is wasei-eigo from 'sub-character'.
wasei-eigo (Japanese-coined English), from sub-character
このゲームではサブキャラクターにも深いストーリーがある。
In this game, even the minor characters have deep stories.
彼はいつもサブキャラばかり使
He always plays only supporting characters.