Okay, last night once again I couldn't sleep at all, which led to incredible thought phases, and that's how I came up with this au:
Big Mama's Daugher!April
This is just a rough, unfinished art for her appearance. Of course, I will eventually change her outfit to be more in line with Big Mama's style and her assistant.
I haven't been in the ROTTMNT fandom for over a year, so I don't know if someone has already come up with this AU (I mean, I've seen it with Leo or Mikey, but not with April.), but I couldn't shake off thoughts about this possibility! The angst!
So far, I have two ideas for it - either April was with Big Mama from the very beginning, or due to an unfortunate incident, she suffered from amnesia and Big Mama took her in.