No, the thought of 'Mary Sue' never actually crossed my mind, except (and this is unrelated) your self-insertion seems to have a bit of a matyr complex.
But that's okay.
Also, whenever I read your fics I always get the impression that whenever Tsu unleashes his power he becomes indestructible because his abilities seem to be infinite. I know that's not the intention, but it may come across that way. However, you still don't write Mary-Suish, so don't worry.