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its elemental hero nova master. You should try checking the next chapter for descriptions through mtl if the current chapter does not have enough clues. Next chapter tells what the hero looks like and the summoning conditions.
iirc, it was deathstroke as he came before deadpool. You can really see the similarities since both are mercenaries and have a healing factor. I'm pretty sure theres more similarities but I havent read the comics in a long ass time so I only got those 2 things on top of my head.