Surprised to not see my waifu on the list actually.
I never thought I would have a waifu actually. I could never connect with any characters, believing that their stories were not fleshed out or written well enough to warrant love. I found characters that were similar to me, as in sickly shut ins, but they never did anything special for me.
I got into Touhou a few years ago, the characters have little to no backstory unlike anime or VN characters, and all I had to go by was their actions or small blurbs during the games. I always played as Marisa, she just felt right. Her speed, her shot, how happy cheery she always appeared, the not giving a fuck attitude, and how she would just quietly borrow those books later. It didnt hit me until I read a gensokyo thread on /jp/, everyone talking about how fantastic it would be to become a little girl, just how they are in their minds.
I then understood how to connect with a waifu. In every form of escapism I have ever used; D&D, EQ, WoW, and almost every RPG or MMO I've ever played, I have always been a cheery happy go lucky mage, a dick to everyone around me, and popular on several games for being a drop ninja.
I could relate to Marisa. Maybe if I lived in an ideal world, where I could be me, and not limited by a frail body, me and my waifu would go on wacky adventures together, and I could properly express my love for her, and maybe she could do the same for me.