I like the fact that Aoyama got his time in the limelight, but it felt like it rushed to the "And then Aoyama realized his insecurities were all in his head and that he's just a member of Class A as everyone else! :)))" end of his character arc while skipping the elaboration on it in the first place. Like, we know he's a coward who overcompensates for it by being flashy, but we never got that insecurity really brought up in the first place; so it's like we got a solution to an unestablished problem and it lacks satisfaction because of that.
Though Aoyama's grimace in that one panel when the exercise ended might indicate the pep talk didn't do it's job. Which would mean it's only just beginning of his development. That'd be nice.
That aside, that bird swarm with Tokoyami in the middle was pretty cool.
As for Vigilante:
Furuhashi was obviously trying to mirror MHA's first chapter (MC's life sucks -> Hero aspirations but no self-confidence -> important-person-to-the-story's in trouble -> MC about to leave -> the begging-for-help look makes him stay -> tries to help but fails -> COOL BUFF HERO MAN comes and saves the day -> MC told he can be a hero), but it lacks Horikoshi's grounding and shambles from point to point without considering the implications of the characters' actions. Also it's weird how Pop Step was left hanging in the air at the end - not even a line of dialogue then bouncing out of there? Also those villains were a train wreck Jesus Christ (at least there was an effort to make them more than Random Villain Group A, though; so there's that).
Knuckleduster is pretty great, though. And since this was only the first chapter, hopefully it'll develop in a better direction (especially since it's from a more lawless down-n'-dirty POV). I'd like to see how the trio's powers work together in tandem; Koichi and Pop Step could easily be speedsters in their own ways when they gitgud.