Julius Kelp is a fictional character from the 1960 film "The Nutty Professor," portrayed by Jerry Lewis. He is a shy and awkward college professor who invents a potion that transforms him into a confident and charming alter ego named Buddy Love. The character of Julius Kelp explores themes of self-acceptance and the struggle between inner and outer identities. His transformation highlights the contrast between his timid nature and the bold persona he adopts, ultimately leading to comedic and heartfelt situations throughout the film.