Simba and Elsa are similar in ways such as: Because they were young monarchs who have been blamed by their villains for threatening their kingdoms and running away only to let said villain take over because of their absence. Also, after abandoning their kingdoms, they both start to care less of ruling their kingdoms until one of their allies warns them about something terrible occurring to said kingdom And their villains blame them for allegedly killing one of their family members they were very close to.(Anna and Mufasa)
Yeah, He's sweet and understanding. Those who are saying that Olaf is annoying and a pointless character don't really know what the story is and what Olaf's role in the story. He has one of the biggest contribution in the unification of the two sisters.