Kristoff is a character in Kingdom Hearts III.
Kristoff is first seen with Anna, Sven, and Olaf at the frozen lake where they first meet Sora, Donald, and Goofy. They introduce themselves and become acquainted. When Sora finds out Elsa is Anna's sister, he tells them that she is in trouble. Kristoff then goes off with Sven and Olaf to find food while Anna and Sora remain behind to talk. The three are then ambushed by Heartless, but they manage to evade them, with only Olaf's body breaking apart. After Sora and the others find and reassemble his body, the Heartless appear again, forcing the group to split.
Kristoff, Anna, Sven, and Olaf make their way to the Ice Palace, where Elsa creates Marshmallow to drive them away. Anna is accidentally struck in the heart by Elsa's ice magic: only an act of true love can save her. Scared for her safety, Kristoff takes her back to Arendelle to find her boyfriend, Hans. As he and Sven leave, they run into Sora's group again just before a blizzard appears around Arendelle. Kristoff then rushes back to save Anna with Sven to give him a ride.
Kristoff runs on the frozen ocean until he finds a nearly frozen Anna. As he rushes to her side, Anna spots Elsa about to be struck down by Hans and rushes to save her sister. Kristoff and everyone else watches as she completely turns to ice. However, her action was an act of true love, which allows her to remove the magic from her heart and restore to normal. Elsa then realizes that love is the way to fully control her magic and unfreezes the kingdom.
Kristoff is later seen at the end, where he sleds down the mountain with Anna. They sled down a ravine, with Kristoff screaming in fear until Elsa creates an ice bridge that catches them. After they land safely, Kristoff falls down on his back with relief.
Kristoff is one of the characters in the 2013 film Frozen.