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Doctor Strange in The Multiverse o Madness - The Loop
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A robot with two upper bodies sharing one set of wheels. The blue-bodied half uses sword attacks, while the pink one uses lasers from his head and arms for offensive power. Whichever side is facing you will attack. Duon also threatens with homing missiles and the blade on top of the blue half.
~ Duon's trophy description in Super Smash Bros. Brawl.
Duon is a minor antagonist and boss fought in Super Smash Bros. Brawl's Subspace Emissary mode.
Duon is a two-sided robot on one set of wheels, with one half being pink and possessing a head cannon and two arm cannons, and the other half is blue with a curved blade on his head tipped in light blue. Both sides have shoulder exhaust pipes in which rockets (pink side) or mines (blue side) can be fired from (as well as their arm cannons). A character who gets behind Duon can trick it into blowing itself up with its own rockets. It rotates one-hundred and eighty degrees to change his attack strategy. The wheels it pivots on is the yin and yang symbols from Chinese belief, symbolizing balance and juxtaposition of two forces.
Super Smash Bros. Brawl
After Solid Snake, Lucario, and Meta Knight kick all the Mr. Game & Watches out of the Halberd's control room, they fall to the bridge and dissolve into Shadow Bugs, which form into Duon. He is fought by Snake, Lucario, Fox, Zelda, Sheik, Peach, and Falco. It is basically a complete stage, Halberd Bridge. After it is defeated by the heroes, it dissolves into Shadow Bugs, leaving behind a trophy of Mr. Game & Watch. It is reformed by Tabuu to face the heroes in the Great Maze, but is defeated again by the heroes, along with the other Nintendo villains such as Bowser, Wario, Ganondorf, and King Dedede (who have joined the heroes in stopping and defeating Tabuu).
Super Smash Bros. Ultimate
Duon appears as an advanced-level primary attack-type spirit. Its spirit battle is a Stamina battle against giant Ice Climbers, in which shooting items picked up by the enemy have increase power. It gives no special effect when used.
Duon was formed by the essence that composes the inside of Mr. Game & Watch, being a group of Shadow Bugs. According to the storyline, Mr. Game & Watch is incapable of differentiating good and evil, and Tabuu manipulates him in this way.