Everyone has a waifu.
Even if they don't like anime. Even if they've never heard the word "waifu". Even if they have never heard of 4chan or moe culture or any of that.
Everybody has some character that somewhere inside they think "Man, I wish I could spend the rest of my life with them." Maybe sexually, maybe not.
Hell, half of the nerds out there probably wish the Doctor was their waifu.