Gasher is a member of the Grays, whose leader is Andrew Quick. He is in the final stages of a disease called mandrus or the "whore blossoms". He is a mean, unscrupulous man who has nothing left to lose. It is possible he was homosexual as he had a former lover called Hoots.
When he reaches Quick's base, he is unable to remember the password and unable to read it on the paper given to him. He has Jake read it to enter the base. After Roland Deschain's arrival with Oy, Gasher is shot in the ensuing struggle.