Professor Utonium is the creator and father of the Powerpuff Girls. He is known for his gentle ways and being much caring for his daughters. He is also an inventor and a scientist and has a huge merit of inventions in his backpack. His interactions with the girls often include what one would think of as common events in a household with three children, such as telling them to eat their broccoli. His first appearance (although his appearance was different) was in the short Whoopass Stew.