Lisby the Cashew Butler is a cashew who wears a green suit and an orange bow tie. He wears a party hat at Peanut Baby's birthday party. He is very happy and joyful.
Lisby reveals he is cheerful and unintelligent when Finn tells Lisby that Marceline is about to sack the castle. When the Duke of Nuts asks who is at the door, Lisby replies "someone who wishes to sack the Nut Castle," thinking Finn wishes to sack the castle instead of Marceline. He also likes to party.
- His voice sounds somewhat similar to Choose Goose's voice.