Gosalyn Waddlemeyer-Mallard is the 9 year old adopted daughter of Darkwing Duck (aka Drake Mallerd). She is a mischievous yet cute and very beautiful tomboy and gets into more than her share of trouble, but she really has a good heart.
In addition to her cuteness and beauty, Gosalyn is an unstoppable bundle of energy and spunk, which Darkwing has said is more of a handful than fighting crime. Her grandfather Professor Waddlemeyer was a famous scientist who was murdered by Taurus Bulba's underlings. She is an occasional crime fighter (going by such names as "Yucky Duck", the "Crimson Quackette", the "Quiverwing Quack", and finally "Gosmoduck" in the Boom! Studios comics), and often gets involved in Darkwing's affairs as herself. Gosalyn being hurt or worse is one of Darkwing's few fears. This applies to the Negaverse version of Gosalyn too, as he intends to leave the alternate reality until he learns that her guardian is Negaduck. Unlike her counterpart, Negaverse Gosalyn is extremely sweet, sentimental, compliant and wears a frilly pink short puffy-sleeved knee-length dress, matching bloomers and black strapped Mary Jane shoes. She first appears in the episode Darkly Dawns the Duck: Part I where she is kidnapped by Taurus Bulba, and rescued by Darkwing Duck, after which she appeared regularly. Gosalyn has also been in several of Darkwing Duck comics.