Yoooo! Totally down for this! Been watching the anime and I'm catching up with the manga. My Quirk idea:

[b]Spatial Constructs:[/b] Explosive Boxes/Barriers

[i]The ability to create Spatial Boxes that can be used as a means of attack, defense and mobility.[/i]

[b][u]Mobility[/u][/b] 
[i]Possibly create a box that he could use to fly around, similarly to Goku's Nimbus Cloud. Or create a series of small boxes that act as stepping stones, that can be sprung off of from any direction.[/i]

[b][u]Defense[/u][/b] 
[i]Large wall-like boxes or smaller, more personal boxes that actually encompass the user to protect them from harm and have the ability to absorb explosions.[/i]

[b][u]Attack[/u][/b] 
[i]Small projectile boxes that can be launched towards an opponent to shatter against them causing a small explosion. Or capturing an opponent inside a box and causing an implosion.[/i]

So basically Hachigen from Bleach, but mix a little Natsu in there. They'd be highly mobile, somewhat brash but altogether creative in their usage of boxes.