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His appearance varies slightly from that of the Finn from Ooo. He has a robotic/mechanical arm fixed with tape, wears a brown sash-like garment (green in "King Worm") which appears to button to his pants, has quite a profound nose as well as much larger, slightly more detailed eyes and lacks socks or shoes. His voice is identical to regular Finn.
- Alternate Universe Finn is seen playing a flute that regular Finn had played in the episode "Prisoners of Love." In that episode, the flute regular Finn plays breaks.