Banshee
Real Name: Sean Cassidy
Universe : Earth-616
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Sean Cassidy was born as the heir to the castle and estate of Cassidy Keep, Ireland, as well as a small fortune. After graduating from Trinity College, Dublin, with the degree of Bachelor of Science, Cassidy became a detective at Interpol, the international law enforcement organization. By the time he married Maeve Rourke, Cassidy had risen to the rank of Inspector at Interpol. Although Cassidy had discovered his mutant powers in his adolescence, he kept them secret, even from the rest of Interpol.

However, Cassidy's powers were known to his disreputable cousin, Black Tom Cassidy, who had discovered that he himself was a superhumanly powerful mutant. Sean and Black Tom had long been rivals, especially over the love of Maeve, before she ultimately married Sean.

Also a member of Factor Three led by Mutant Master and fighting along side Changeling, Blob, Mastermind, Ogre, Unus the Untouchable, Vanisher, and Humus Sapien.

Credit: marvel.fandom.com

1ST APPEARANCE
Volume 1 January 1967