Banshee (Sean Cassidy) is a Marvel Comics superhero, a member of the X-Men.
An Irish mutant, Banshee possesses a "sonic scream," capable of harming enemies’ auditory systems and causing physical vibrations. He is named after the banshee, a legendary ghost from Irish mythology, said to possess a powerful cry, although the banshee spirit is invariably female, something the character's creators were unaware of.
A former Interpol agent and NYPD 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 was, however, a mentor of the 1990s-era junior team Generation X.
Banshee is a mutant whose superhumanly powerful lungs, throat, and vocal cords could produce a sonic scream for various effects, in concert with limited, reflexive psionic powers which directed his sonic vibrations. He could hover or fly at the speed of sound, and could carry at least one passenger. He could overwhelm listeners with deafening noise, stun them with tight-focus low-frequency sonic blasts (effective even against shielded ears by penetrating the skull via bone conduction), plunge them into a hypnotic trance, disorient them, nauseate them, or simply render them unconscious. Using sonic waves, he could rapidly vibrate himself or other masses at will. He could generate sonic blasts which struck with tremendous concussive force, liquefying or outright disintegrating targets at his highest levels of power. By radiating sound waves outward and reading the feedback, he could locate and analyze unseen objects in a sonar-like fashion. By modulating his scream's harmonics, he could confuse most scanning equipment. He could instinctively analyze, replicate, and block sonic waves or vibrations from other sources.
A gifted detective, veteran undercover operative, and formidable unarmed combatant, Cassidy was an excellent marksman and a competent amateur machine-smith, well-versed in combat strategy & tactics, and teamwork drills, from his training at Interpol. An effective educator, organizer, and lobbyist, he was also an avid American country music aficionado and skillful amateur piano player. As Cassidy, he wielded conventional firearms, sometimes loaded with explosive "micro-bombs." As Banshee, he wore synthetic costuming designed to resist air friction, usually including underarm wings that helped him glide on air currents and his own sonic waves. The "ribbons" on Banshee's costume (a visual trademark of the character) aid him in his flight.