Marshmallow is a former minor antagonist turned anti-hero of the 2013 Disney movie, Frozen. It is not his actual name, but a nickname given to him by Olaf when he, Kristoff, and Anna encounter him.
Marshmallow serves as a brutish bodyguard to Queen Elsa, and despite being a good guy, he attacks Anna, Kristoff, and Olaf after Anna made him mad by throwing a snowball at him.
Later, Marshmallow shows his heroic side by fighting off Prince Hans (who was not suspected to be the movie's main villain at the time) and his men from proceeding to reach Elsa, but as he tried his best, he fell in the mountain gap, seemingly dying.
After the credits were over, it is revealed that Marshmallow survived the fall, only to find his mistress's ice castle abandoned and finding her old tiara, which he happily dons on himself and becomes the new ruler of his mistress's old castle.
Marshmallow is voiced by Paul Briggs.