>>52094983>opera singer gym leaderFantina is designed like one but she maintains being a performer by appearing in Master Level contests. Roxie is a singer who actually sings the lyrics to her gym theme.
>rocket scientist gym leaderBlaine's a scientist who designed his gym as a quiz show showing him to be an eccentric genius.
>author gym leadernot a gym leader but Shauntal has unique pre-battle quotes where she recites a piece she's working on that references notable trainers from across the series.
>programmer gym leaderClemont? but he recycles Blaine's gym concept. Other than that I guess Sophocles and Molayne.