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Jackson Overland "Jack" Frost is an immortal supernatural being much like the Guardians, who was once human. Unlike the others, however, he is a loner, the classic rebel without a cause, sarcastic and mischievous. He has incredible control over ice and the cold. He is a spirit of games and fun times, but when at last he discovered the purpose behind his amazing powers, he became a true Guardian, representing Fun.

Jack has incredible weather powers that he controls with the help of his magic staff: He can call and ride the wind, float like a snowflake, conjure ice and snow, freeze objects or even people solid with a mere wave of his staff, make images drawn on frosted window panes come to life, and spread the feelings of fun and joy with his frost, snowflakes, or snowballs.

Jack later discovered he can unleash energy bolts of freezing cold and ice, which he first used against Pitch.

Jack Frost is a mischievous teenage hellion who has no interest in being bound by rules or obligations, and just wants to spread his winter magic for the sake of the personal amusement of himself and children. Despite these traits, Jack is also gentle and generous.
The source of his anti-social behavior towards the Guardians and refusal to ad here to rules was mostly because of his frustration with the Man in the Moon never answering his questions about who Jack was or why the Man in the Moon created him, and also because no human, child or adult, was ever able to see him for centuries since no one believed in him. But as he spends time in the company of the Guardians, each of them would have an effect on him that would change him from a mischief-making winter spirit to a full-fledged Guardian in his own right, as well a hero.

It was his refusal to give up in the face of overwhelming odds that enabled him to help one child, Jamie, to keep his beliefs in all of the Guardians as well as finally believe in Jack enough to see him. And it was his desire to protect Jamie, as he once did his sister, that helped him realize his center, as a Guardian, is Fun.

Jack proudly accepted the duties and responsibilities as the Guardian of Fun. His purpose, to spread the feelings of Fun and Joy so as to spread happiness to bolster the faith Children have in the Guardians.

[OOC: Taken from http://riseoftheguardians.wikia.com/wiki/Jack_Frost]