I have to admit I am enjoying the idea that for at most 1 trait and two feats a character can pick up Fast Healing 2. This is due to Chimera Soul giving the required subtype to anyone who knows a single maneuver from it.

The shifting feats seem fun, though I am sad at the incredibly short duration for expanding oneself two size categories (just 2 rounds per shift). It is nice that works regardless of creature type though.

I am looking forward to getting a chance to test out Chimeric Soul in an upcoming game. I think it will make for an interesting character. Spontaneously growing random natural attacks should be fun.