He wears a large pair of round glasses, a black shirt, jeans and black and white sneakers. He is almost bald with only a bit of grey hair on the sides of his head. It is assumed he doesn't shave. For formal wear, he wears a brown tuxedo mask and wears a brown top hat on his head.
He is extremely greedy, sometimes selfish and will do almost anything for money. In episode Brat Attack he even sold Ami and Yumi for ten million dollars to give them to a kid, named Timmy, for his birthday. He would always rush to a show just to get money. Despite this, Kaz deeply cares for Ami and Yumi and wouldn't live if they weren't around. He despises Jang Keng and Tekirai, because Kaz is a constant victim of their mischief. However, he adores his pet dog Domo a lot.
- Most of the time, when Kaz tries to get rid of something or wants something to be done, he uses the contract to make Ami and Yumi do this.
- In the episode Visiting Hours, we find out that Ami and Yumi don't know his last name.
- Some people asked the real Kaz what he thought of his cartoon counterpart, but he admitted he had never seen the show because in real life, he's actually dead.
- Kaz appeared in Oldie AmiYumi, even though in real life at that time it takes place, he would die from old age. In real life, he died in December 19, 1998.