Gin Rummy is the best friend of Ed Wuncler III. The two engage in various crimes that include robbery, murder, and breaking and entering. He's obviously intelligent, but very violent, just like his friend Ed. He'll give his opinion on anything, and whether you like it or not, he'll let you know. Like Ed, Rummy is very dangerous to anyone who happens to tick him off. This includes even children, as seen when he violently yells at Riley in the episode "The Reality" when he doesn't understand what Rummy means and keeps saying "What?" over and over again. His dialogue in this scene is also reminiscent of one of his voice actor's(Samuel L. Jackson) scene in the movie "Pulp Fiction."
220px-Ed and Rummy

Ed Wuncler III and Rummy.