This is For all of your questions I'll try to update but I'm really behind in school. And as for why katsumi and izumi not being his mains in the harem and why they bully; for katsumi, she didn't want see izuku die from doing hero work so she thought of bulling so she could stop his dream but later on she developed her ego from the teachers that praised her, as for Izumi she also didn't want to see izuku die from hero work , but she didn't know what to do she didn't want to hurt him but katsumi convinced her to. For the reason why izumi and katsumi aren't alphas are because I don't see them like that, I just see momo as an alpha of a harem. To clear something up when izuku was three he wanted to go to the quirk doctor but could because he wanted the media to stop bothering him so when he and izumi turned 4 they went to quirk doctor one had a quirk and the other didn't. I also understand why that haven't been going into detail about how much time it took for something to happen or to do, and all I have to say is that I can't really as much as I did when first started. As for the reason why izuku hasn't been mistreated by society was because nezumi has black mail that somehow kept everyone at bay. even if izuku was mistreated he had two people their to support his dream couldn't loose hope in himself. Also izuku is older than izumi. And the last question was already explained