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Like a true catalyst in chemistry, they bring about a change in a system without being changed themselves. A good example is Eddie Murphy's character Axel Foley from Beverly Hills Cop. His personality is already fully formed and distinctive at the story's beginning. H e doesn't have much of a character arc because he has nowhere to go. H e doesn't learn or change much in the course of the story, but he does bring about change in his Beverly Hills cop buddies, Taggart and Rosewood. By comparison they have relatively strong character arcs, from being uptight and by-the-book to being hip and streetwise, thanks to Axel's influence. In fact, although Axel is the central figure, the villains main opponent, and the character with the best lines and the most screen time, it could be argued that he is not the true Hero, but the M e n t o r of the piece, while young Rosewood (Judge Reinhold) is the actual Hero because he learns the most.