They're creatures from The Legend of Zelda series by Nintendo. River Zoras, that's just what I'll called them, showed up in the first 4 games. There are blue, cultured, Zora's in Ocarina of Time, and other later games, but I was interested in how the "early" ones would look. Some only seemed able to swim, in the original LoZ they were referred to as "she", in A Link to the Past, they had a king, and many seemed able to walk. Gel-Pen and Photoshop with Tablet coloring. This was originally done for a then friend's RP site, Realms of Hyrule, but the guy turned out to be a jerk so I didn't end up doing much more for the project.