Lisa the Fox was the Annoying Character Ever. She became Rookie's After Ego. Rookie does not want to get transformed into a Fox.

Lisa the Fox could be allergic to flying. So here is an example:

She couldn't transform back into Rookie when she hugged Steven or has an (Allergy) Inflation.

After the last day of school of 2025, Rookie went to the hospital, and Lisa came to reality (But Rookie didn't transformed) and Rookie will no longer transform into Lisa anymore. And Also, Lisa will no longer transform back into Rookie because she's out of him.