<Li> David Hyde Pierce as Slim, a walking stick and Francis and Heimlich's friend . </Li> <Li> Joe Ranft as Heimlich, a plump, German - accented caterpillar that longs to be a butterfly . </Li> <Li> Denis Leary as Francis, a short - tempered ladybug that is constantly mistaken for a female . </Li> <Li> Jonathan Harris as Manny, a praying mantis and magician in P.T. Flea's circus . </Li>

Who plays the ladybug in bug's life