|Size:||A lot taller than common tree friends.|
|Friends/Allies:||Ginny and Homer|
|Enemies/Rivals:||Sir Emily Chaotic|
|First Appearance:||Four of a Kind|
Jen-Jen is a 13 year old human girl who has a secret related to the tree friends. She gave them the power to transform themselves into powerful creatures from different levels. She also appeared in Happy Tree Friends: Worlds Collide! where she battles Zombie-Flaky as a cameo in Zombiepalooza!.
When a tree friend grows extremely huge and hazardous, Jen-Jen transforms. If the tree friends transform, she gets her bike. In Four of a Kind, Jen-Jen's battle outfit looks like pink tights, but in all the other episodes she has black tights. When all tree friends level up to the 3rd level, Jen-Jen transforms as well as wearing a helmet with colorful patterns, a blue spotty vest, gloves, pink boots, red pants and the same black tights.