Sean Astin, in the animated series, voiced Chester. He loosely sounds like Krillin from Dragon Ball. 

Here is an example: https://youtu.be/UzmfdeGZW-o "Chesty" (he hates being called that) is a Siamese Cat who likes to read, listen to his favorite jazz music, and relax. Unfortunately, with Bunnicula and the Supernatural around, half the time, he's trying to avoid being scared out of his wits, considering he's easy to scare. 

He tries convincing himself, at least what I see, that all of the SuperNatural can be proven through Science. That's not the case.