Kasumi! I played the first one and it was awful, I love the Dead Or Alive games, but this seems intentionally pervy, which is almost a little unnerving. I love the tanlines though, that kind of attention to detail is....unique!
I love all the DOA games including the volleyball ones. My female friends seem to love them more than I do. I use Kasumi and Hitomi the most just like in the fighting games with every one else sort of split from time to time.
I'm more used to the actual fighting games, but I did play some of the first Xtreme Beach Volleyball game *groan*...Anyways...Kasumi's great, and ya gotta love Ayane (tag team both of them with their school girl outfits! can I get a hells yeah!?)...though I think I like to play as Tina most...Oh? Are you hurt down there on the ground? ARM BREAK...!! LEG SNAP...!! ^_^
Kokoro or Helena for me. Although, I don't like the second DOA Extreme, the first one's alright, in multiplayer. Plus the first one was my first Xbox game.