Mars

"'Go away DON‘T COME BACK!' Mars to Anna and Kristoff"Prince Mars "Marshmallow" of Arendelle is the second created adoptive son of Queen Elsa. He is a bit rough around the edges.

Personality
Marshmallow takes care of his 5 younger adoptive brothers in the Ice Castle. Olaf is really the only one whom he trusts and who can calm him. He despises his aunt Anna and uncle Kristoff.

Trivia

 * Even though he is younger than Olaf, he is four times his size.
 * Mars is named after the Roman god of blood, war and violance. This matches Mars' personality.