Soul Eater...is it that one anime where their partners turn into weapons? Excuse me, I only got up to episode 2. But anyways the only thing that comes to my mind is GhostX. When i played the community was pretty big albeit that no one wanted to help me answer my questions. But that was way yonder things may have changed since then. Hope my post helped you in any way.
http://www.youtube.com/watch?v=s5xkYcGeDyI
http://ghostx.gamengame.com/main.jce