Trugen

Trugen (also known as True Mugen or Final Mugen) is a theoretical being that many believe would be formed should every Mugen in the multiverse fuse together. Trugen is Mugen's "Ultimate Self", being the perfect form of his existence taking traits and skills from all other Mugens. Becoming Trugen is Legen's ultimate goal, and should they ever succeed, it would spell the end of the multiverse as we know it.

Appearance
As Trugen is the perfect form of Mugen, Trugen would appear as the perfect Mugen being. His features would all appear perfect, if not a bit uncannily so.