Olaf was meant to symbolize the relationship between the sisters. The film makers integrated elements of both sisters into his character. (1) He's artistic like Elsa; when we first meet him he's wondering what colors would go best with snow. (2) He longs for warm weather like Anna, (3) He likes animals like Anna; Olaf immediately makes a connection with Sven and earlier in the film we saw Anna playing with ducklings and scratching Hans' horse. (4) He's fascinated by the night sky just like a little girl named Anna used to be. (5) He immediately bonds with Anna and loves her dearly, just like Elsa does. (6) He's fearless and determined when it comes to helping those he loves just like Anna; he latches on to Marshmallow's leg to try to slow him down even though he knows it isn't likely to do much. (7) He doesn't listen to others, just like Anna; when Kristoff tells him to stay out of sight on their way into Arendelle, first thing he does is happily greet one of the residents. (8) He knows what love is just like Elsa; he knows that love is about putting others first and self sacrifice. (9) He's an optimist who doesn't consider the possible limitations he may have and just plows ahead exactly like Anna. (10) He loves the idea of summer and warmth and wants to experience those even if doing so is risky. (11) He loves people and a good party just like Anna; he immediately joins in when the trolls start dancing and singing. (12) Olaf physically comes apart during several scenes in the film and is in danger of melting just like Anna and Elsa's relationship is, but in the end, once the sisters are reunited, Elsa makes Olaf's ice permanent by giving him his own personal flurry. Edit