If I had to only have 1 waifu it would be Luka. Combining the Kanji for Meguri (巡, circulate or around) and Ne (音, sound) and "nagare" (流, flow) and "ka" (歌, song) or (香, scent)her name means: songs to all around the world as scent spreads Originally planned to be the first Vocaloid & named Hatsune Miku, she was moved to third after focus groups found that she might be too sexy & (current) Miku being a kid might appeal a younger audience. She has, in my opinion, the most beautiful, melodic Japanese voice of the Vocaloids as of the V3 release. With tweaking, she easily is the best English as a second language Vocaloid. Soon as I can afford it, I'll be getting V4. Having had numerous top singles: Rip=Release, Just be Friends, Luka Luka Night Fever & World's End Dancehall, Corruption Garden, No Logic & my all time favorite Double Lariat, she has been featured in over 500 albums and a couple thousand songs.
Regardless of what she wears, she looks incredible. And those Neko mimi.... Kawaii af.
You know that you may have a waifu obsession when your kids can pick out her songs from your play list and your IRL wife buys you a dakimura like the last photo for Christmas. The wife even refers to Luka as "Your Girlfriend".
This ^ is the reason I even know what a Vocaloid is. I was looking for the name of the show " the pink haired girl" my son had just watched was when this got my attention. The rest is history.