Hmm, interesting idea for a Semblance. The mechanical specifics of the weapon can be whatever, I get the intent of the bullets are to have an electric based ammo and an explosive based one, you don't have to get bogged down in the details for that. I think I understand what the retracted armor looks like, like big orbs or cylinders over major joints? It might be difficult to say he'd walk around like that, if I'm thinking of it properly, why not have a big smart cape thing that conforms to the suit and keeps itself from getting caught on stuff when not in use? Might could be fashionable and functional. :P
And the specifics for the Semblance in combat don't need to be completely explained, we can say some sciency-wiency thing with mass/magnetism/vacuums/whatever, is it also possible to use it to slingshot projectiles too? What I'd mainly want to know more about is the attracting actual attention, I'm assuming it's a ranged thing and involves his Aura mingling with other's Auras like Rose and B.B.'s does, but is it just noticing him more or do people actually find him more attractive? And what's the, I guess, rate of attracting? Like did the teachers single him out as a favorite early on, or was it over months/years? And how likely is it that people notice it affecting them?
Sorry for the barrage of questions, it's just that Semblance can affect other characters very easily, just wanna know all about it 'fore I approve it. :P