Styx is Pluto's youngest moon and son. He is friends with his other moons of Pluto and also Pluto. His best friend is Nix. He does not get attention and forgettable to other planets, including some of his siblings sometimes. He was formed after a crash on Pluto. His first appearance was in Pluto is a planet again. He was mistaken by Theia as a chopped asteroid.

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