In Reveal Novum, Book's definition of Evil Leafy says:

Evil Leafy - Leafy wannabe. What a loser.


In Get Digging, Pencil warns the Puffball riders to watch out for a wild Leafy, which may have been referring to Evil Leafy. Later, Book, Ice Cube, and Spongy must flee from Evil Leafy.

In No More Snow!, Book and Ruby escape Evil Leafy but then immediately have to run away from her. Book cuts the rope, crushing Evil Leafy, Puffball, and Fries.