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Duke Suck-Lemon is a short lemon person that appears in "Too Old," sitting beside Finn at the dinner table in Castle Lemongrab. Instead of talking, he makes grunting noises. Finn switches places with him to sit closer to Princess Bubblegum.
Duke Suck-Lemon is a short, plump lemon person. He is exceptionally short, being less than half the size of Finn. Duke Suck-Lemon has a round, cone-shaped head with closed eyes and a tongue sticking out.