I've come to the perfect conclusion to put the brave debate to rest:
It's Sandbag.
Wait, don't go! Hear me out!
- He's floaty, while also a bit heavy. He's a sack of potatoes, but he's made with fabric and stuffing. To be both a bit floaty, albeit a heavier fast-faller, would make sense for a Sandbag.
- The stats are similar to zoners and brawlers. He could easily be a brawler, getting up-close and personal with his body.
- He slides a bit. He's always done that in every Smash game. He has a bit of a slide-y sense of physics to him.
- A bit smaller than Mario? Maybe in terms of his eyes, yes, but then the top of his head doesn't count towards that metric, making his actual scale somewhat taller. It would fit.
- The codename? He's very brave. Look at all the hell he goes through without cowering or fleeing. After all, he is Sandbag. You have to be brave to be a Sandbag.
I've cracked the code. You're welcome.