Jessica Harley (The Next Chapter)

Leatherhead appears in Teenage Mutant Ninja Turtles: The Next Chapter. She is an ally to the Ninja Turtles.

History
Leatherhead starts as a pet animal mutated by mutagen in most versions but in TMNT Next Chapter (much like the Archie version), she starts as a poor human named Jess Harley who lived in the swamps, and became transformed into a humanoid alligator when the "witch" Mary Bones used the Turnstone on her. Then after that, Baxter Stockman rescued her and took her in, raising her as his own child, along with the other mutants.