Bullseye is a character who has a vendetta against the superhero appearing in comics by which company?
Bullseye (comics):  A psychopathic assassin, Bullseye uses the opportunities afforded by his line of work to exercise his homicidal tendencies and to work out his own personal vendetta against Daredevil. Daredevil (Marvel Comics character): Daredevil is a fictional superhero appearing in American comic books published by Marvel Comics.
Marvel