This mecha paper model is Dr. Dextrose, a Candy Person who first appeared as a speaker at Princess Bubblegum's science barbecue in "The Real You", based on the American animated television series Adventure Time, the papercraft is created by WebDude.
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 while muttering to himself.
Dr. Dextrose resembles a marshmallow wearing a suit and has rouge hair. Like most doctors in Ooo, he has a Scientific Parasite living in his coat pocket, which is a little creature that feeds on "smart brain waves." [Source: wikia]
You can download the papercraft template here: Adventure Time - Dr. Dextrose Free Papercraft Download