character song; character theme song
Abbreviation of キャラクターソング. Used in anime, game, and voice actor fandoms for a song performed in-character or associated with a specific character.
See also: キャラクターソング
The character songs for this anime are sung by the voice actors in character.
推しのキャラソンが発売されたので、すぐに買った。
My favorite character's character song was released, so I bought it right away.