Beginner friendly? Pick Rachel. She's noob friendly and sexy at the same time. On top of that, if you go in-depth with her (as far as you can, lol) you find even MORE POWER!
I think the ironic part is that at 1st I picked Ayane when I 1st played DOA5u(Core Fighters), but in time, I now have a goal to defeat her. lol When I played her, the term "beginner friendly" didn't come to mind.