Ok so i have a weird idea for izuku being a fatty but its more of an au than anything. Considering the bullying he got due to his status, and him being quirkless plus how he s huge nerd, i had the idea of hom just giving up. Instead of chasing his dreams he becomes more and more shut in and possibly even gives up school entirely and becomes a neet otaku. Due to how inko wants the best for him she tries her best to coddle him and this leads to him becoming lazier and more hedonistic tp the point when he reaches his 20 s hes become such a fatass that just doesnt care but needs stimulation. Like i know there s a lot of people that enjoy bakudeku but id imagine this version of izuku really would long for women to the point of being a bit of a perv (maybe thats too much idk). Ideas depending on the feeder:
Ochako: would help him open up more and he d be a bit healthier in general but still a massive guy but is mostly a stay at home husband. She d use her quirk to make him move around and even if he becomes immobile she ll use her quirk to lift him because she loves him jiggling
Momo: this would go in a more mutual gain type scenario where he helps her with her quirk and manages to help her get huge in the process and makes his nerdy superhero otaku knowledge useful.
Tsuyu: she d act more motherly, dote him and treat him like a king and her toungue would be useful for... certain things. She d also hug him during the winter due to him constantly being hot no matter what
Jirou: kinda hard to know what she d be with him but id imagine jirou becoems a rockstar superhero and maybe he like a trophy husband to her and she s proud of how much she s enabling him.
Mina: she d be all other him, with her possibly making himgo more on the sexual than the feeder stuff but she d adore to enable his addictions and make him as happy as could be.
Toga: NOW TOGA, toga on the other hand i ve had ideas for her brewing in my head. I can imagine they meet via a dating website where its all about dating fatties. They go on a date and its the first time he goes out and things go well. Everything is rather well and good until she decides to capture him and make him as fat as possible. She d probably break him to have his mind solely on getting bigger.