Nym is one of Falstaff’s followers, and is obsessed with humors.
He refuses to help Falstaff with his plans of seduction, and to revenge himself on the fat knight’s insults convinces Pistol to join him and inform Ford and Page of Falstaff’s designs on their wives. He has a very one-track mind. He is a conman, who manages to trick Slender out of an expensive chain.