Manga similar to Boku no Hero Academia?

hmmm, that kinda depends on a number of things if you ask me. Now keep in mind that what all I have written may already have been read by you a while ago. I just thought I'd be nice to anyone else who stumbled on your thread & wants a tip :P Furthermore, i am saying it right now, all most all of these are really enjoyable manga. Though I shall admit that some have a Very DRY start. Give it the chance & it will grow on you. Promise :D (except for Trinity Seven, I just put that for fun XD)

1&2/Do you like Academia because of its expansive character rota? (by that I mean do you like that this manga has the chance to develop profuse quantities of characters via the storyline) or even an expansive selection of powers & whatnot; if so then I would suggest: Denpa Kyoushi, Mahou Sensei Negima, Ansatsu Kyoushitsu, Shaman King, UQ holder & GetBackers.

3/Do you like the plot-to-action ratio; where there is a mysterious (or overpowered) protagonist/mentor and the plot eventually explains the who & how? If so then go for Witch Hunter, Black Cat, Gamble Fish, Defense devil, Dengeki Daisy, Fullmetal Alchemist, Air gear & Area D.

4/ Finally, do you like Boku for its classic Underdog story? (how it's a weak protagonist gathering his strength to be the best). Now if it's that, then I say go for Shijou Saikyou no Deshi Kenichi, Rave Hunter, Trinity Seven, Brakeman, Girls of the Wild's, & Magi: Labyrinth of Magic.

Hope this helps!