Sven was a simple reindeer. He enjoyed carrots, spending time with his best friend and a nice warm barn for sleeping.
Don't get him wrong, he liked Anna. She was good for Kristoff. A grown man that talks to reindeer? But Sven got lonely. And that man made of snow was always around. Did he ever stop talking?
Worse yet, his nose was literally made of Sven's favorite food in the entire world. It was almost too tempting to be around him.
Sven sighed watching Kristoff and Anna frolic in the crocus fields. Olaf would grow on him soon enough.