Jennika (IDW)

Jennika, also known as Jenny or Jenn, is a tough but caring mutant turtle who serves as an instructor in the Splinter Clan. Originally human, she became a mutant after a life-saving transfusion of mutagenic blood. Initially a Foot Assassin, she later joined the Splinter Clan, founding a dōjō in Mutant Town. Jennika has a complex history, including a stint as a vigilante and involvement with the Street Phantoms. Despite her tough exterior, she has a sweet and caring nature, akin to a "big sister" to the other Turtles. She struggles with anger but has better control than Raphael, and she's passionate about heavy metal music.