Literature
Bunnicula (First Designs/Concept Art Designs)
While I was just searching Bunnicula images on Google, I found a page that was in Polish, which was an interview with Jessica, but the interesting thing was there are images of the first/concept art designs of Bunnicula, Chester, Harold and Mina.
Which Are those that were on that page:
As you can see, those were their first designs of them. Bunnicula only had just some small changes in his design while Chester, Harold and Mina had completely different changes from their early designs to their final designs.
Also, In case anyone is curious about that Polish page where I found that concept art with the interview that they made with Jessica,