Ryu
Amaterasu
Arthur
I was set on taking these guys from the start, simply because I love their games. Fortunately I like what I've done with them so far; Ryu typically takes point, and once he gets in, his kung-fu can plow through a whole lot of enemies. Arthur can provide some amazing pressure as either an assist or as keepaway. Amaterasu is a bit of a hybrid thanks to her omnipotency, so I like having her out too. Besides, it's Okami; I'd take her on even if I couldn't play her for the life of me.
As a fun fact, with the way I usually line them and their assists up, they spell out "AAR-BAY".
These guys are clearly pirates.