The last premise sounds really cool in a Phantom Thieves-meet-the-Undersiders kinda way (if you don't know who the Undersiders are then you haven't read Worm, which means you need to read Worm). Could focus on a team of disgruntled or disenfranchised youths rebelling against the system and using their Quirks to commit heists or other vaguely anti-heroic crimes (maybe even while secretly attending a hero school under different identities).