With the unprecedented amount of rain coming from Vah Ruta, the Zora needed to rely on an outsider. Sidon will step in and say that Link is only here because he himself had invited him.
The King's aid, Muzu, is strongly opposed to Link helping out the Zora. After the King speaks about his lost daughter Mipha, Sidon will jump in, shifting the conversation to the problem at hand, which is the Divine Beast Vah Ruta. This causes Sidon to recall Link as well, then remembering where he had heard the name from before. When Link meets with King Dorephan, the King will recognize Link as the Hylian Champion from 100 years ago. Finally when Link crosses the Great Zora Bridge, Sidon welcomes Link to Zora's Domain and wants to introduce Link to the King. He appears again when Link is at Luto's Crossing, but is interrupted as a Blue Moblin appears to attack Link. Later after Link is crossing the Oren Bridge, Sidon appears to mention that there are a lot of enemies up ahead.
He appears again near the Bank of Wishes to offer encourage. He first appears right after the main path crosses over Zora's Domain twice, at which point he mentions that there are a lot of monsters and Link should proceed carefully. Periodically as Link travels towards Zora's Domain, Sidon will appear from Zora's River to give him encouragement. Reach Zora's Domain Main article: Reach Zora's Domain After speaking with Sidon at the Inogo Bridge, this will begin the Reach Zora's Domain quest. Instead, he gives Link an Electro Elixir so that he can withstand some electricity attacks. Unfortunately the enemies up ahead all use electricity, but that doesn't cause Sidon to lose any confidence in Link. Sidon mentions that because of the rain, Link cannot climb any of the nearby cliffs, so he'll have to take the main path. Sidon hopes that Link helps out Zora's Domain as it currently is in grave danger due to the perpetual rainfall that is caused by Divine Beast Vah Ruta. After finding out that he is specific to name, he applauds the fantastic name, but wonders whether he had heard of it before. Upon meeting him, Sidon introduces himself as a prince of the Zora. Link first encounters Sidon at the Inogo Bridge, which crosses over the Zora River. Zora's Domain is in terrible trouble and Sidon is in need of a strong Hylian to help out. When traveling through the Lanayru Wetlands, Link will encounter numerous Zora, who implore him to visit Sidon over at the Inogo Bridge. He treats everybody with respect, even members of other races, which is why he is so adored by his fellow Zora. He had a very cheerful demeanor and always remains positive. Even though Sidon is a member of royalty, he does not let that affect his personality. Sidon is the son of King Dorephan of the Zora and the younger brother to Mipha, the Zora Champion.