Proinsias Cassidy, also known mononymously simply as Proinsias or Cassidy, is a fictional character and antihero in the Garth Ennis comic book series Preacher and The Boys, respectively co-created with Steve Dillon and Darick Robertson, and the former's spin-off prequel Cassidy: Blood and Whiskey. Introduced as a drug-and-alcohol-addicted Irish vampire en route to Dallas to open a bar called "The Grassy Knoll", Cassidy ultimately joins Jesse Custer and Tulip O'Hare on their search for God, becoming Jesse's best friend and falling in love with Tulip. After Jesse's apparent death, Cassidy and Tulip form a romance, which ends on Jesse's return, with their rivalry leading to a duel. Wishing to atone for all that he has done in life, Cassidy walks into the sunlight to die. However, having made a deal with God before his confrontation with Jesse, in order to allow Genesis (deemed a threat to God) to be destroyed, Cassidy ensures that both he and Jesse will be resurrected, before God himself is killed by the Saint of Killers. As Jesse leaves looking for Tulip, the redeemed Cassidy watches his first sunset in years as a human being, pledging to act like a man. In an epilogue in the fourth volume of The Boys, set years later, a more heavyset Cassidy (now going by his first name) has finally opened his "The Grassy Knoll" bar (albeit in New York City instead). Closing his bar on St. Patrick's Day so that he and fellow former alcoholic and friend Billy Butcher can speak in peace, the two discuss their struggles with addiction before Butcher's protégé Hughie Campbell arrives, and Cassidy closes up his bar, smiling.
