Mr. Grouper is the best teacher in the world! He's friendly, funny, and full of information! He genuinely respects the Guppies' intelligence, encourages their curiosities, and nurtures their imaginations. Mr. Grouper sees every day as an opportunity for discovery. He knows how to be silly and play along with the Guppies, joining in their pretend play in the classroom and out. Mr. Grouper always ends the school day with an awesome field trip and a celebration of the episode's topic. Mr. Grouper can also change colors. He is a very good friend to all the Guppies.
Mr. Grouper is orange, with yellow stripes on both sides of his body.
Because every episode takes place in the classroom, Mr. Grouper has appeared in every episode of Bubble Guppies.