Duon (デュオン, Duon) is the sixth boss encountered in The Subspace Emissary. He doesn't hail from any particular series, and is unique to Super Smash Bros. Brawl. He is created by several Shadow Bugs that have gathered in a single, very powerful being.
His name is derived from the Latin word duo, a word meaning twosome, or a group of two, alluding to his two-faced design.
