Great Zora

From Zelda Wiki.org

The Great Zora (キングゾーラ Kingu Zora) is king of the River Zoras in A Link to the Past. He is found by the Zora's Waterfall in Zora's Lake. A basically friendly character, he sells flippers for 500 Rupees a pair. As a bonus, he tells Link that he can use the Whirlpool Waterways to warp from one body of water to another in Hyrule. Link must meet him & purchase Zora's Flippers in order to complete his quest.

Great Zora as Link purchases Zora's Flippers in A Link to the Past

Great Zora's friendly response to Link after telling him he just dropped by in A Link to the Past