Koko Hekmatyar, main character in manga/anime "Jormungand"
Koko, character in anime "Zatch Bell!"
Koko, gorilla who learned sign language
Koko, Australian dog actor in film "Red Dog"
Koko the Clown, animated character by Max Fleischer
Koko, "size" in Finnish
Tapu Koko, a Pokemon from the seventh generation games, Pokemon Sun and Pokemon Moon