I kinda want Admire Japan if only for the endless Yogibo memes. And awkward comedy in fanworks with him being both Buena Vista's brother and uncle.
Though his race record is not really impressive. Best that could be managed is him becoming a mob uma in a potential Deep Impact route, I guess.
Considering we couldn't get Makahiki or Sciacchetra for Anime S3, the best shot at this rate for Uma to indulge in the endless Yogibo memes is retconning Gimlet's story to have even more Versailles Farm references, or for Oju (who's rumored to be added for the upcoming console game) to bring about the Yogibo jokes.
That or Rose Kingdom to be added in the game, but I feel like Rose'd be busy bugging Buena and Flash instead....