Doccy

Dr. Zeus, aka Doccy was a tabby cat and Adam's best friend. He was born in 1999, and died in late 2012.

Super Bubby
Doccy appears as the main dueteragonist and dumb. In Super Bubby, he was a prince, but became an inventor in the next few books with no signs of being a prince. Adam purposely made him a prince in the prequel Bubby's High School to match it up with the first book. In the tenth book, taking place 16 years later, he was a father. He still was dumb, and liked Scooby-Doo and Mario.

Trivia

 * In real life Adam read Doccy the first chapter of Harry Potter and the Philosophers Stone.