Jennika

Jennika, also known as Jenn or Jenny, is a superheroine appearing in Teenage Mutant Ninja Turtles comics published by IDW Publishing. She was introduced in issue #51 of the first IDW Publishing comic book series in 2015, and was developed by Tom Waltz and franchise co-creator Kevin Eastman. She was designed by series artist and writer Sophie Campbell. Jennika is the second female mutant turtle character in the franchise's history, after Venus and preceding Lita the year after her mutant form first appeared.

Jennika is depicted as a human assassin for the Foot Clan, though she eventually allies herself with the Teenage Mutant Ninja Turtles. After being severely wounded by Karai, Jennika is transformed into a mutant turtle when Donatello uses Leonardo's blood to give her an emergency blood transfusion. As a mutant turtle, she wears a yellow mask and wields tekkō-kagi.

Starting from issue #117, Jennika was revealed to be bisexual, forming a new romantic relationship with one of the mutants of Mutant Town, the pig mutant Sheena, due to their shared love of music.

In addition to the mainline Turtles comic book series by IDW, Jennika has also been the lead in the three-issue miniseries Teenage Mutant Ninja Turtles: Jennika in 2019, which was followed by the six-issue sequel miniseries Teenage Mutant Ninja Turtles: Jennika II in 2020.