Melanie Whitney is Kevin's baby sister.
Personality[]
Melanie is cheery, innocent and silly, and sometimes does things that get Kevin into trouble. However, she can also be upset fairly easily. For example, in Dog-Gone Kevin, Kevin (in Krypto's body) snatches Melanie's teddy bear and almost destroys it before tossing it across his room. Melanie starts to cry, but Kevin apologizes to her and consoles her by asking if she can play with him.
Melanie loves Krypto and once saw him change into Superdog.
Appearance[]
Melanie is a 2-year-old toddler with beige hair tied in short pigtails. She wears a dull blue T-shirt and pink overalls. In the episode "Diaper Madness", she is seen wearing a diaper.