Have any of the waifu lovers played Bloodborne?
The Plain Doll is a clear candidate to be a waifu for people. She is literally a doll, and she says things like this, "Hunters have told me about the church. About the gods, and their love. But... do the gods love their creations? I am a doll, created by you humans. Would you ever think to love me? Of course... I do love you. Isn't that how you've made me?"
Maybe people could get more used to the idea of a doll and a waifu using her analogously?