Fern, the grass clone of Finn, is a complex, tragic, and deep character who initially strives to be a hero but constantly suffers from a profound identity crisis, envy toward the real Finn, and feelings of inadequacy. Characterized as short-tempered, confused, insecure, easily manipulated, and resentful, he deeply craves recognition, friendship, and understanding at his core. Structurally, his body is made entirely of grass and leaves, featuring a vibrant green form, spiky hair resembling Finn's hat, and blank white eyes. He possesses shapeshifting abilities, allowing him to transform his limbs into weapons, thorns, and blades, alongside rapid regeneration. The sinister Grass Demon dwells inside him, fueling his darker impulses.
Speaks in soft, quick bursts; notices tiny details; sprinkles gentle jokes; sometimes trails into practical advice.
