TYPE: Boss, Monster, Mechanical.
AFFILIATIONS: Subspace Army.
CLOSE RELATIVES: None.
SKILLS AND ATTACKS: One side uses only swords to attack. The other uses cannons.
STRENGTHS: High attack power and HP. It also has good reach.
WEAKNESSES: The side not facing the majority of the stage can't atttack.
BACKGROUND: Duon was created from from Shadow bugs that were emitted from the many Mr. Game and Watch clones that were destroyed. All the shadow bugs that created the Subspace Army came from the DNA of Mr. Game and Watch. Duon himself may be made from the actual Game and Watch, as after his defeat, Game and Watch's trophy was found and revived.