I think what a "Non-Undead" would be is, someone/something who reached a second life by means other than resurrection or reanimation which I believe is the typical process for something "Undead" and the resulting state would likely be distinct from each other.

I can only think of a Holy Knight/Crusader who may be able to have this second life, perhaps bestowed upon by a higher power, by means of Rebirth into a different/higher being, and the wings and halo can imply that (and the glowing blue eyes, because glowing eyes are always cool) . 

Looks amazing. Please tell me me more about the concept.