tsuukaa_(umamusume)
Tsuukaa is a name shared by a mob character in the game as well as a minor anime-only Umamusume character.
The anime character's role as the one who defeated Satono Diamond (umamusume) at the Tokyo Yushun (Japanese Derby) by a nose during Episode 5 of season 3 marks her as being a stand-in for Makahiki (racehorse).