Billy Butcher has a lot of ups and downs in the comics. He has to deal with personal demons and external threats, which leads to some unexpected developments.
In the comics, Billy Butcher doesn't possess powers. He relies on his combat skills, experience, and a never-back-down attitude to fight against those with supernatural abilities.
Well, it could be a number of characters depending on the comic series and storyline. Maybe it was a villain seeking revenge or a hero acting out of necessity. The circumstances could be quite convoluted.