This is a hard one.
I think Tahu would be that friend I could do a lot of fun things with, we'd butt heads but he's loyal and good at heart. Lewa would be the most fun I think, but could be recklace. Kopaka's a bit of a recluse, but he'd be the best listener and would understand my issues with social situations. He'd be better one-on-one. I'm gonna go with Tahu.