Defenestrator is a member of Section Eight, a “superhero” team led by Sixpack, delusional wannabe superhero and supporting character in the comic series Hitman.
Defenestrator has no real powers other than perhaps some above-average strength, as he constantly is seen carrying around a window. His fighting style consists of throwing people through the window that he carries, hence his name.
Defenestrator apparently perished in Section Eight’s final battle when he was thrown through a window by a demon.