Oxfyll/UTAUOxfyll made a fanmade version of Miki Yukine called Ushi Miki (Cow Miki), as a pun on how he loves milk. XD I think it's pretty awesome, so now he's an official character. -v-)J
It's like his version of Tako Luka and Hachune Miku~ heeh.
I think you get Ushi Miki by adding g-18Y0 flags.
Here's a sample of his Ushi Miki mode
Art by Oxfyll at DeviantArt