He is a courageous mountain man that becomes a companion of the fearless Princess Anna during her quest to find her sister, Elsa the Snow Queen. Kristoff is an Orphan and we see him get adopted by Bulda (one of the trolls) at the start of the movie.
He's a rugged individualist and a kind of a loner. He's his own man and the guy who feels he doesn't need anyone in his life. Sven can get along just fine—thank you very much. He is an ice harvester. And in cold regions where we visited there are people just like farmers who harvest ice from frozen lakes. They cut it out and place it on long flatbeds and put it in storage. And that's how our film actually opens—we see the ice harvesters at work and we meet, at that time, a very young Kristoff and Sven. He's 8 years old and he's learning the trade from the adult ice harvesters. We see a baby Sven with him, too, who's trying to tow his own block of ice with the big guys. Kristoff is such a loner that he is reluctant when Anna asks him to help her navigate the mountain terrain to find her sister. But he knows the area better than anybody else, so he agrees.
Kristoff is a true outdoorsman. He lives high up in the mountains where he harvests ice and sells it to the kingdom of Arendelle. Rough around the edges, Kristoff's the strong, no-nonsense type, who follows his own set of rules. He may seem like a loner, but he always has his best friend by his side—a loyal and extremely mangy reindeer named Sven.