A brown horse with a stocking on his right back leg and a wide blaze marking.
He gained fame, initially, for coming in second place for both the Satsuki-sho (to Geoglyph) and the Tokyo Yushun (to Do Deuce), before turning to the 2022 Autumn Tenno-sho, where he covered and overtook runner Panthalassa's 15 to 20 lengths lead, earning him his first GI title. Equinox then went on to win the 2022 Arima Kinen as well as the 2023 Dubai Sheema Classic in his overseas stint. Afterwards, he won the 2023 Takarazuka Kinen by a neck, almost losing to Through Seven Seas due to a fumble.
He is Kitasan Black's first G1-winning progeny and proved himself to be not only one of the best racehorses of his generation but also becoming the best rated racehorse in the world.
In the context of Umamusume, as the son of Kitasan Black, most fan designs portray him in some form of Japanese-style outfit, often with a Sun & Moon motif with a red and blue color scheme that references the racing silk of Silk Racing, Equinox's owner.