Devouring Dimensions: Starting with Marvel's Untouchables

Reborn as a lowly pariah in the Marvel Universe, he awakens to the Devouring Evolution System, and can gain superpowers through killing and fuse and upgrade them. In order to reverse the fate of certain death, he devours heroes, villains, and alien creatures with brutal means, and finally breaks through the dimensional wall to invade the DC and Japanese comic worlds and establish a dark order. [No nonsense, just do it, no Holy Mother, don't watch if you mind]