Finn, Prismo, Martin, Princess Bubblegum, Cosmic Owl, CMO, GOLB, King of Ooo, and Magic Man!

Finn, PB, The Lich, Martin, Prismo, Gunther (the dinosaur), Simon, Marceline, Tiffany...

Jake, Lady Rainicorn, Gunter, Cinnamon Bun, and Peppermint Butler.

Lol like every main character