Bunny is a Grouch, who has sworn to never show her face on Sesame Street. But, as Oscar's sister, she appears in Episode 4237 as a surprise guest for her mother on Grouchy Mother's Day. Mrs. Grouch gave her the name Bunny just to annoy her.
In April 2011, Oscar answered a couple questions about his sister in the following interview:
- Patalano, Heidi. Oscar the Grouch: Green before it was cool. April 21, 2011