Quackerjack is a recurring antagonist in Darkwing Duck. He is the former owner of the Quackerjack Toy Company who used his toys to turn to a life of crime upon going out of business. He is a frequent accomplice of Megavolt, Mr. Banana Brain's boss, and one of NegaDuck's henchmen.
Quackerjack was the owner of his own toy company, but the company went bankrupt because of the competition with a popular video game, Whiffle Boy. He decided to take his revenge on video games for good by breaking into a Whiffle Boy warehouse and kidnapping two guards to find out where the game tournament will be. After he finds out, he blows up the warehouse and goes to wreak havoc during the tournament, but Darkwing Duck foiled his plan. He turned to a life of crime, using his enhanced toys equipped with weapons to rob banks, the money from such robberies was used for more toy experimentation. He really loves toys, and all he wanted was to make people happy with his toys.
Quackerjack occasionally forms a pair with Megavolt and commit crimes as a rather powerful duo. He likes to mock of Megavolt by calling him "Sparky", which Megavolt really hates. He later joined the Fearsome Five, adding his own skills to the rather odd mix of villains.
Quackerjack is really a very happy-go-lucky, whimsical and energetic guy. He laughs and makes fun of everything, never ever losing his good temper. He definitely has a dark side, and was meant to be a very wicked and malevolent character in the beginning, but, to the creator's dismay, he is shown as a rather quirky and unconventional villain. He takes pride in toying with his victims, mocking them. Without his wackiness, he becomes unruly, pessimistic and whiny, moping about, a rather frightening jup in personality from his colorful, comedic, whimsical and entertaining self. During "The haunting of mr. banana brain" episode, he seemed unfazed with the fact his doll was moving on its own, pointing out instead the change of voice from the high-pitched tone he typically used. With that, it is suggested that he is insane. Understandably, he harbors a particular hatred of Whiffle Boy, the hit video game that not only cost the poor man his company, but his sanity along with it.
- Quackerjack appeared in 12 episodes throughout the show.
- Quackerjack is one of the few characters seen killing/murdering people.
- He is similar to the Joker from DC Comics.
- In a Darkwing Duck episode "Days of Blunder", he has the ability to use hypnosis
- He also speaks German on a few occasions.