Pokemon. The one on the left is a Shiny Gardevoir, although I've yet to encounter one with such long hair. The one on the right poses a much more interesting challenge. They seem to be a merger between a Gardevoir and a Mismagius. Some scientific hybrid? A lucky breeding outcome? Goliath 18 would by the first person I ask for a definitive answer.
I looked at the original creator's stuff. They don't claim that the witch is a fusion, but it obviously is because I've seen similar before. The vampire is just their own personal Gardevoir modification with darker colors and longer hair. Meh, they're both pretty. It's whatevs.