Chillblaine (Arrowverse)

Mark Blaine, (died 2023; resurrected 2023) self-styled as Chillblaine, is a major character in The Flash. He was a resident of Keystone City, a member of the Team Flash, a former member of the Rogue Squad and a former employee of Ivo Laboratories, who was fired after creating cryogenic technology. He is also a close friend of Caitlin Snow and the ex-boyfriend of Khione.