An example of Olaf's unique ability.
Olaf is a small snowman divided into three balls of snow, though he has the ability to rearrange his appearance at will. Three black rocks modeled as buttons are on his body, one on his midsection and two on his bottom. Underneath his bottom are two stubs of snow that serve as his legs to move around. He has two sticks as arms and three twigs on his head that resemble small strands of hair. Each arm has four points acting as fingers. His head takes up a third of his body, and is oval-shaped with a stretched face. The snow around the top of his mouth is shaped to resemble buck teeth. In between his eyes and mouth is a carrot nose. When he was inanimate, his eyes were also made of rock. However, when living, his eyes are cartoony with black pupils. He also has eyebrows above them. Olaf's body parts are also capable of autonomy, and can be rearranged or separated from Olaf without any harm happening to him. He cannot feel pain either - when he walks onto an ice spike, resulting in the spike passing through his mid-section, he merely looks down and says "Oh, look at that. I've been impaled..." and giggles. He seems to be ticklish when Kristoff pushed him away from Sven
Olaf coming across the Saffron Crocus flower in the teaser trailer.
Olaf and Sven star in the animated short used as the teaser trailer for the film. It begins with Olaf wandering around the snowy landscapes of the forest when he comes across a Saffron Crocus flower. Intrigued by its beauty, Olaf takes a whiff which causes him to sneeze, his carrot nose flying off into the center of an icy lake, where's it's spotted by Sven, who's on the other side of the lake. The sight of the carrot was enough to get Sven extremely excited and head onto the slippery platform to fetch it, having Olaf believes he's trying to eat it. A race for the carrot then ensues, and the duo finally reach it, but Olaf accidentally flings it back onto the snowy land. Sven's able to escape the lake and retrieve the carrot before Olaf, much to the snowman's sadness. However, Sven returns and places the carrot onto Olaf's face, revealing he was merely trying to help get it back. Overjoyed, Olaf thanks the reindeer, the two forming a new friendship just before Sven's shedding causes Olaf to sneeze once again, though it's his head that goes flying off as opposed to the carrot.
The Origin of Olaf
“Do you wanna build a snowman...?”
―Anna to Elsa
When Anna and Elsa were children, Elsa would use her snow magic to play with Anna. A favorite pastime activity for the two sisters was building snowmen. On one such occasion, Elsa helped Anna build their own snowman they named Olaf to play with. At this point, Olaf is not alive, but Elsa does voice him, saying, "Hi, I'm Olaf, and I like warm hugs!", to which little Anna says, "I love you, Olaf!". Many years later, Elsa would exile herself from Arendelle after her magic was discovered and deemed dangerous. In the midst of embracing her abilities at her new ice palace home, Elsa recreates Olaf, but because of her magic, he is enchanted and given life, though Elsa was completely oblivious of her newfound creation. However, the enchanted Olaf has no memory of the moments spent with Anna and Elsa as a lifeless snowman years ago.
Olaf then wanders around the mountains alone and blissfully lost, until he bumps into Anna, Kristoff and Sven the reindeer, who seek to bring Elsa back to Arendelle so that she can bring back summer after she accidentally caused an eternal winter. Anna initially panics upon seeing him, incidentally accidentally kicking his head off and tossing it between herself and Kristoff, before throwing his head lopsided onto his body. After putting it up right, Anna decides to add a carrot nose to the snowman, only to accidentally push it into too far. Olaf begins to admire the short end of his new body part, before Anna pushed it out properly on his face. After making introductions to each other (and Olaf mistakes Kristoff and Sven to have the same name as the latter), Anna soon recognizes Olaf and quickly assumes it was Elsa who built him, to which he confirms. Kristoff then tells Olaf of their mission to bring back summer after Olaf constantly asked what their intentions on finding Elsa were. Extremely giddy with the idea of summer and its warmth, Olaf decides to happily guide the group to Elsa's castle, though Anna refrains from telling him about the dangers of summer for a snowman, leaving Olaf comically in the dark.
Return to Elsa
Olaf arriving in the ice palace to reunite with Elsa.
After a short journey, Olaf and the others find Elsa's ice palace, and the little snowman couldn't have been more eager, rushing up the icy staircase and to the main entrance door. However, Anna decides it may be best to enter alone, with Olaf and Kristoff, and request they remain outside for a minute. Olaf does just that, sitting outside beside Kristoff and counts to sixty, rushing inside once he does, completely overjoyed to see Elsa again. His presence proves there's love and beauty in her powers, and remind her of the joyful moments she spent with Anna. However, their childhood memories also remind Elsa of the haunting night she nearly killed her sister, prompting her to leave the scene, asking Anna to leave once again. Anna refuses to leave without her sister, but the stubbornness only makes Elsa uncomfortable, causing her to lose control over her powers once again and accidentally freezes Anna's heart. Olaf and Kristoff runs to her aid, but Anna claims all's well. She tries once again to get Elsa home, but the Snow Queen refuses yet again, forcefully prompting her next action due to Anna's stubbornness.
The Creation of Marshmallow
In order to keep them away, Elsa creates a personal bodyguard named Marshmallow, a giant snowman. Olaf is thrilled to see another enchanted snowman, but is immediately kicked out along with Anna and Kristoff. The harming of Olaf angers Anna, and the princess fiercely (or as fierce as she can seem) throws a snowball at the snow beast, provoking him and leading to a chase. Olaf tells the gang to move ahead as he'll distract him, but with his body dismembered, that immediately proves to be difficult. Anna and Kristoff reach the cliff of a mountain and begin making a snow anchor to lower themselves down safely. Olaf meets up with them seconds before Marshmallow, and tries his luck again in taming the monster, but to no avail. Marshmallow continues his pursuit for Anna and Kristoff, but Olaf tries to battle him, leading the smaller snowman to be kicked over the cliff edge, leaving Anna and Kristoff to be captured by Marshmallow, only to escape due to Anna's quick thinking, causing them both to plummet down alongside Olaf, though they all survive.