WAIFU. The plural of waifu is WAIFU, you fucking mongoloid. Apropos of waifu: a female character is not a "waifu"; she may be somebody's waifu, but that makes her "their waifu," not "a waifu." Moreover, a waifu chooses her waifuist. A waifu can have only one waifuist, and a waifuist only one waifu. If a female character is absurdly popular (e.g., has lots of fan-art, many "claiming" she's their waifu, etc.), she is already taken and cannot make you her waifuist. If you want to know if your waifu is already engaged to a waifuis, simply do a rule34 search. More than zero results? She's taken.