Valkyrie (ヴァルキリー, Varukirī) is a 4-year-old stock horse with Australian roots and the horse that Gyro Zeppeli rides in the Steel Ball Run race. Gyro specifically chose the horse for its stamina and durability. As noted by Diego Brando, Valkyrie has a quirk where it sways suddenly to its left for every eight breaths it takes.[1]
After the race is over, Johnny brings the horse back to Naples.
Valkyrie makes an appearance in All-Star Battle (PS3), its remaster and Eyes of Heaven as a technical playable character through Gyro.