Mushroom Doctor

From the Super Mario Wiki

The title of this article is conjectural; an official name for the article's subject has not been found, so it has been given a fitting title by the editors. If an official name appears that is not from the English Super Mario Bros. Encyclopedia, it is requested that the article should be moved to the correct name.

Not to be confused with Toad doctor.
The Mushroom Doctor, with Mario and Luigi, while Bowser and Kooky are watching.

The Mushroom Doctor is a Toad doctor, and a minor character from The Adventures of Super Mario Bros. 3 The Mushroom Doctor only appears in Reign Storm. Prior to the events of the episode, he is the one who figured out that Princess Toadstool was overworked, and needed a vacation away from the Mushroom Kingdom and the Mario Bros..

Very little else is known about the doctor, as he had no lines, and was only seen and mentioned towards the start of the episode.