Sean “Banshee” Cassidy (November 3,1966) This Day In Comics
An Irish mutant, Sean Cassidy possesses a “sonic scream”, capable of harming enemies’ auditory systems and causing physical vibrations. He is named Banshee after a legendary ghost from Irish mythology, said to possess a powerful cry. A former Interpol agent and NYPD police officer, Banshee was always a decade older than most of the X-Men and had only a relatively short tenure as a full-time X-Man.
He first appeared in X-Men #28 (November 3,1966) as an adversary to the X-Men under coercion, but soon befriended the team. Banshee is a mutant whose superhumanly powerful lungs, throat, and vocal cords can produce a sonic scream for various effects, in concert with limited, reflexive psionic powers which direct his sonic vibrations. He can hover or fly at the speed of sound, and can carry at least one passenger.