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Gardevoir, a cute, empathetic psychic type and she has an elegant and feminine design. Also she looks alien enough to be exotic but human enough to not be too weird to find it attractive.
Yeah fanart adds boobs, but it's not really the initial reason she gets waifu'd so much.
If I had to pick a less vanilla or more feral choice it'd be Sylveon. Seems like a good and sweet lover, and has a very high affection for its trainer. Thats such a big plus that I'd settle for either gender