Rivan is a character in The Legend of Zelda: Breath of the Wild. He is the son of Trello who was a member of the Big Bad Bazz Brigade as child and later went on to become a Zora Knight alongside his daughter Dunma.
Rivan is the son of Trello who was a member of the Big Bad Bazz Brigade when he was still a child before the Great Calamity. He used to play with his fellow brigade members Bazz and Gaddison. At some point, Hylian Champion Link joined the group acting as a mentor and big brother figure to them. 100 years after the Great Calamity, Rivan is shown to have become a Zora Knight alongside his old playmates Gaddison and Bazz the latter of who had become Captain of the Royal Guard in Zora's Domain. At some point during the Age of Burning Fields, Rivan had a daughter who later joined the Zora Knights and began serving alongside him.
Rivan is shocked when he encounters Link who had awakened from his 100 year sleep in the Shrine of Resurrection where he had been recovering from his injuries he received during the Great Calamity. However like his fellow Bazz Brigade members, Rivan holds not ill feelings towards Link and even warns him not to talk to his father Trello or any of the Zora Elders as most of them hold Link responsible for the death of Zora Champion Princess Mipha.