I'm sure I stated this on some other forum, but this is the first DOA I found interesting. I've always been willing to overlook the overwhelming jabs at it just being a fanservice fighter, but the visuals themselves never sat right with me. The characters, short of Ryu, Hitomi, and Kokoro, just didn't look right to me, and those three are only where they are since 4 came out.
Then the official art and renders came out for 5, and suddenly this cast of bizzarely odd characters... I dunno, matured. Kasumi and Helena were the most amazing changes, such that I strongly believe they are the most beautiful of the cast, and they finally looked... right.
Then Team Ninja obviously hired some psychics, because there was still a problem: there wasn't a style that caught my eye. I don't know how many times I watched gameplay of 4 and 5's demo to find someone who I could find intruiging enough to play, and then they announced Mila. Pretty, Spanish, and an MMA fighter. There is just something so satisfying with her rather simplistically brutal style.
Oh, right. Favorite character. Well, Mila's story's kinda weak, so I'm going to say Helena, then Kasumi.