Seiun Sky is a laid-back Uma Musume who always appears relaxed and shows little motivation, yet she is a brilliant strategist. She attends Tracen Academy as a classmate and rival to Special Week, King Halo, El Condor Pasa, and Grass Wonder. Excelling as a Front Runner in medium and long-distance races, she has strong stamina and wit growth rates. In the anime, she participates in fun episodes like superhero skits and cheering at races. Modeled after the real racehorse that won the Satsuki Sho and Kikuka Sho.