**Deadpool 2 plot details revealed below.**
Eddie Marsan's role in Deadpool 2 was pretty much a mystery until the sequel was released in theaters last week, and it's not hard to see why. His role is minimal as the sadistic and religious headmaster of the Essex Home where young mutants are ridiculed and tortured. The name "Essex" is a reference to Nathaniel Essex, aka Mr. Sinister, who is responsible for using Wolverine's DNA to clone Laura Kinney/X-23 in the futuristic timeline of Logan.
Aside from that, Marsan's character helps drive the plot, as his mistreatment of Russell/Firefist (Julian Dennison) sets off a chain of events that will lead Russell to a life of violence, which eventually motivates Cable (Josh Brolin) to travel back in time to assassinate the pyro-mutant before he can murder Cable's family. Yes, we know it's all very Looper-esque.
According to The Hollywood Reporter, during early talks with director David Leitch, Marsan was told that his role would be that of a zealot, akin to a person in our own world who would tell kids to "pray away their gay." Indeed, the headmaster tells mutants that they are perversions of nature while belting out Bible passages he believes to be relevant to his mission of cleansing the world of mutantkind.
After the violent Charlottesville riots erupted last summer over the removal of a statue of Confederate general Robert E. Lee, the entire crew of Deadpool 2 knew what kind of person they wanted Marsan's villain to be.
"That kind of informed what we were doing with the character, i.e. somebody who didn't want to be replaced by people different than them, who was scared of change, scared of the other," Marsan told THR. "This character came out of the zeitgeist, really, because the production designers, the writers, everybody was coming up with this character. He was the archetypal, fascist, perverted bigot."
In the end, Deadpool and his fellow X-Force members are able to stop Russell from killing the headmaster, who, instead of being grateful, verbally berates the mutants before being run over by Dopinder's taxi.