The youngest child of Hal and Lois, at five years old, Kelly began to feel different about themself and believed they were hiding their feelings until they had a very bad day in fifth grade. They would often go to Hal for support, and at some point afterward, they came out as non-binary to their family.
Kelly is self-sufficient and is very adapted to the immaturity of their family. Unlike their older brothers, Kelly was very different and is the only child of Hal and Lois who has no history of crime, which is why they are considered untouchable in family conflicts. While they are a good student, and receive excellent grades, they seem a little unchallenged with school. Kelly is very close to their family and although they show some annoyance or indifference with their parents and some of their siblings, it is shown that they love them deeply.