I legitimately hope that BNHA takes from American comics and allows for several people to work on the title. Vigilantes is proof that Horikoshi will allow for legitimate spin-offs and not just "oooo they're chibi" type spin-offs. I honestly think that Horikoshi would be okay with more spin-offs if they were good ideas. Here's some ideas that I would want to see get greenlit in order of what I want the most to least:
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Boku No Hero Career:
Basically just Deku trying to be an adult, while being a teacher, while being a hero. Basically, I'm asking for J. Michael Strazinski's run on Spider-Man. But I could specifically see somebody having a field day with how this new society works, and how hero-work is moving more towards helping the oppressed rather than fighting sludge monsters. There'd still be sludge monsters, I'm not trying to de-comicify My Hero, but it's a whole lot more of trying to fight the root of the problem. I think a strength of this potential story could be the use of non-violent conflict resolution. There'd obviously be action, but nothing bigger in scale than say the Overhaul fight. If you want to add inherent stakes, you can always have Deku's armor get damaged or something. Gun to my head, I could see the first long running arc about Deku and crew trying to end a prostitution ring. I also wouldn't mind an Izuocha subplot, but that's just my personal preference. I admit that part of this is just me missing JMS' Spider-Man run.
Skycrawler Adventures:
Okay I only had one cool title name; sue me. But I just want more of Koichi, man. Horikoshi has said he's a sucker for Spider-Man and at the very least one cover is literally a direct homage to Ultimate Spider-Man Vs. Venom. If BNHC is JMS' run on Spider-Man, this is Tom DeFalco and JM DeMatteis' runs on Spider-Man. It's that early 20's, post-college and in your first big kid job vibes. Maybe we start with Koichi starting up his own hero agency and struggling to maintain it. Maybe we finally make him canonically autistic? I admit I'm projecting with that one. But I think that Skycrawler Adventures could be like Chainsaw Man Part 2. Not exactly, but in terms of making this into an epic.
Boku No 52
This title requires some light explaining. Back in the day, DC had an event called 52. This came right after the event Infinite Crisis. After Infinite Crisis, the DC universe had a one year time-skip. However, 52 also released at the beginning of said time-skip. The premise of the book being that each issue would cover one week, and by the end of the series (which had 52 issues), you would know everything that happened during the time-skip. The only real caveat with this book being that Batman, Superman, and Wonder Woman were practically off the table. So, you had to use more minor characters. The book had 4 all-star writers and it was an absolute smash hit. It's still beloved to this day. I think that BNHA could use something like this. It can even fit my prior two pitches in there. But you can also have chapters about the new class 1-A, Bakguo yelling at clouds, is Endeavor still trying to be a father, what is Momo up to, literally anything. You can have it showcase a bunch of new mangaka. I'm sure that Horikoshi had drawing assistants, let them have a shot at this. This one is definitely the least likely to get passed. But, I also think it has the highest potential.
I'm willing to bet that Jump DESPERATELY wants to have another Naruto or Bleach or One Piece. Specifically a manga line that lasts for a STUPIDLY long time that's extremely popular that they can ride into the sunset. I think that My Hero has that potential. I just think that they should keep Horikoshi as a consultant, and do brand new things.