Jupiter In Leo. The Leo influence on Jupiter adds optimism, enthusiasm, cheerfulness, and ambition. It injects a sense of drama and showiness, which if controlled adds effervescence, but if allowed to get out of hand can become bombastic. Here too, is generosity and a liking for the best of everything. Leo is a sign of creativity and this will be expressed in any number of ways – acting, dance, creative writing, and film-making. There are powers of leadership and an excellent organizing ability. These individuals often do great work with children and young people.