Professor Utonium

Professor Utonium is the creator of the title protagonists of The Powerpuff Girls. He is a scientist who acts as a father figure to Blossom, Bubbles and Buttercup. He created them by accident when his lab monkey, Jojo, pushed him and caused him to break his jar of Chemical X into his "perfect little girl" formula. He is voiced by Tom Kane.

In Powerpuff Girl Z, he has a son. At the final episode, he thought the Powerpuff Girls Z would lose their powers after defeating HIM, but he was wrong when the Powerpuff Girls Z showed that they still had their powers.

Trivia

 * He appears very similiar to Samurai Jack, another Cartoon Network character by the same animators.  His full name is rumored to be Professor Jack Utonium.