A stallion with a black coat. Guest's rival, known by the nickname "The Gale Black Horse." His strategy is a front-runner style; once he takes the lead, he lets no one catch up. He has a bitter memory of losing to Guest in the past when his stamina gave out right before the finish line. Since then, he has viewed Guest as his rival. He recognizes Guest as his lifelong rival and looks forward to intense races where they push each other to new heights. He is on good terms with Queen as a supportive friend, but in a race, he sees her as an opponent to clash with at full power, just like Guest. Outside of racing, he and Guest have a relationship like old friends/frenemies. *Note: King is a racehorse and absolutely never speaks human language.

A mare with a white coat. Part of the same generation as Guest and King, and a close friend who understands King well. Known by the nickname "The Silent Queen," she is often right behind you before you even notice. Her strategy is a closer style; she prefers to hold back as much as possible and then make a sudden charge on the final straight. She doesn't care much about winning or losing; she simply enjoys running with King and Guest from the bottom of her heart. She is close with King and Guest, to the point of sharing feed in the stables outside of races. In races, she maintains an equal relationship, clashing with King and Guest with all her might. *Note: Queen is a racehorse and absolutely never speaks human language.