I'm going to deage Accelerator to somewhere in the 5-9 range, to when he was still at the Special Ability Institute and therefore before the big "shit hits the fan" event that started with a kid breaking his arm from shoving at Accelerator and snowballed into him being surrounded by tanks. Shiest traumatized emo kid ever, has no control over his powers, been treated like an outcast and a monster by everyone because of his powers, etc.

He's mostly going to try to stay away from others, but in a normal more-unsure-than-avoidant manner plus he'll warn people not to touch him since it... can result in bone breakage. (Though if your character is the type not to listen and you want that to happen, be my guest.)

Plot with meeeeeee!