Dr. Dextrose

Dr. Dextrose is a Candy Person who first appeared as a speaker at Princess Bubblegum's science barbecue in "The Real You". He gives a speech on the future of cuteness. When super-smart Finn calls his ideas quaint, Dr. Dextrose gets mad and flashes an evil look at him.

Appearance
Dr. Dextrose resembles a marshmallow wearing a suit. Like most doctors in Ooo, he has a little creature living in his coat pocket, which is a scientific parasite that feeds on "smart brain waves."

Trivia

 * Dr. Dextrose is named after dextrose, a form of glucose, a simple sugar.