Negaduck

An evil Darkwing from a parallel reality called the "Negaverse" which is a nightmarish reverse version of St. Canard. Negaduck is virtually identical to Darkwing except that the colors of his costume are red, black, and yellow. Negaduck has no special powers or abilities but can disguise himself as Darkwing to make the hero look like a criminal. He is very ruthless and has no problem with hurting people to get what he wants: great wealth and authority over both worlds. He is the leader of the Fearsome Five, a group he formed with Bushroot, Liquidator, Megavolt, and Quackerjack, all of whom are somewhat scared of him. In "The Duck Knight Returns", he discovered Darkwing's secret identity and attacked him at home - an event that caused the superhero to retire for a year - and later teamed up with Magica De Spell to ruin Darkwing's reputation with brainwashed, alternate reality versions of the hero. An unrelated, earlier Negaduck was created (in the episode "Negaduck") by Megavolt's Tron Splitter, an evil copy of Darkwing that had been "galvanised" into a powerful and malevolent being; in the comic "Crisis of Infinite Darkwings", the Tron Splitter was used to stop the main Negaduck, reducing him to multiple microscopic particles of good and evil.

In Ultima, Negaduck is a member of the Organization who leads the Fearsome Five into battle whenever they are involved.