Fenton Crackshell is a thirtysomething accountant who stumbled into the role of superhero quite by accident. When he's not tallying up figures for Scrooge McDuck and his enterprises, Fenton can be found at home with his mother in the trailer home they share or out stopping baddies from stealing McDuck's fortune.
Lately he's become more and more involved in crimefighting in St. Canard, much to Darkwing Duck's chagrin. Although his ego can rival the masked mallard's, he's a bit more fragile under the robot suit than he lets on. Unlike Darkwing, Gizmoduck is revered by all, topping many a "favorite superhero" list both in Duckburg and St. Canard. Gizmoduck wouldn't mind sharing the spotlight with Darkwing, if the caped crusader would just give him a chance, but he also doesn't mind swapping insults should the occasion arise. They are too alike in many ways and can't help but butt heads.
Fenton often visits his good pal Launchpad when Gizmoduck is in St. Canard, and they reminisce about their adventures pre-Darkwing. He has an on-again, off-again relationship with Gandra Dee.