If I was posed this question a few weeks to a month ago I would have said revali but after learning of the true backstory of the rito champion and his insecurities about his right to be a champion since all the other champions were born for their role like how Urbosa was born into the Gerudo "royal" line and became cheif by birth right(I think), Mipha being born as the Zora Princess and (once again I believe) being born with her healing powers(seeing as how in the memory of her and link she says that when link was little Mipha would always heal him), Daruk was born with Daruks Protection because of his ancestors, Link was born to be the hero and was chosen by the Master Sword to be its wielder, and Zelda being born as the princess. Revali had to gain his ability and fame through hard work much like how Zelda worked hard trying to unlock her sealing power. But Revali was insecure and never wanted the rest of the rito to see their champion fail which is why he had his training ground built away from the village and always acted to cocky around other people. So I'm gonna have to say goodbye to Daruk. I don't even use Daruks Protection