@Sakura Cartelet Lumine's harem has grown quite a bit since that pic was uploaded. As the additions include Noelle, Hu Tao, Ayaka. Heck, even the Raiden Shogun.
@Lewdholder No she's a half-quilin which is closer to a unicorn than a goat. Her being a cocogoat is more of a joke/meme than a serious statement of her race.