Due to popular request, here is some concept art for Vivi’s family~

Mr., Mrs., and Grandma Yukino (雪野).

Grandma and Mr. Yukino come from Japan while Mrs. Yukino is American.

So we have a last name for Vivi now, Vivi Yukino.  (And for the record, the reason I haven’t said anything about it until now is that I have been *WILDLY* indecisive about it.)