Alopex and Koya!
this an idea i had that could take place after Northampton, after the ending where (SPOILERS) Alopex is left behind and Koya flees with a bleeding neck wound inflicted by Leo. so after that, Alopex would be wandering aimlessly around the woods and she stumbles across Koya, who is totally humiliated after the Turtles defeated her. she’s too ashamed and afraid to go back to Foot and face Shredder with her failure, so she’s letting herself bleed out on the forest floor in disgrace.
Alopex stops the bleeding and does her best to nurse Koya back to health, but Koya is still refusing to live and decides her plan is to sit in a tree and starve herself to death. but Alopex soon wears her down with little offerings of food and convinces Koya that there is life beyond the Foot, and the two of them team up and decide to go find the Turtles and mess them up, or maybe they just live together peacefully in the woods.