Elvira is an imaginary cat who Chester and Patches fought over.
Patches and Chester fell for Elvira and tried to compete against each other for her love, but she turned out to be just a demented hallucination and nothing more than a sheet and a balloon.
Elvira was a purple cat with yellow eyes and purple eyelids. She turned out to be a balloon and a sack,
Elvira seems to share the sameness interests as Chester, mainland because she was just a figment of his imagination.
- It is unknown why Harold and Bunnicula didn't inform Chester and Patches that Elvira wasn't real earlier.