Hmm, this is interesting. I'll go ahead and make quite high demands, picking only people that might actually work out in a relationship...
Well, there goes Fal. Musical ambitions I can't match.
Torta... I don't really know her well enough. Though previously I've said she's my closest waifu candidate, so now I'm confused.
Hoshimemo!***... No, too many problems with SPOILERS.
Hoshimemo!Isuzu... promising candidate. However she's doing quite poorly academically, and it's apparently not due to skipping class or being lazy. I can't approve of such a low intelligence stat.
KS!Rin... No. The issues man, the issues. I'd like to be her friend though.
KS!Hanako... Two people with social phobia? I have this feeling it would not end well.
KS!Shizune might be a good match... Smart, has a huge competitive streak. However I'm probably outmatched by her massive drive and stuff, and it would get tiring eventually.
Ever17!Sara... She's a genius though. Too much difference in int stat, might be hard.
I don't know enough about Chie in Kira Kira... qq
I was recommended S;G!Makise Kurisu... Which is a probable good pick, but I haven't finished s;g yet. Also int stat.
CLANNAD!Kotomi... int stat.
G-sen!Haru... fuck damn it.
Sonohana!Mai... Holy shit yuri fans will kill me oh fuck. However, I find her one of the most likeable heroines, she's smart but probably in reach of my int stat... However, she's probably too much of an extrovert for me to handle. Nevertheless, best candidate yet.
Rewrite!Akane... Oh fuck extrovertish. Well, admittedly SPOILER is apparently made out of introverts mostly. About on Mai's level, though her massive issues later on would have to be magicked away.
...Well fuck, maybe there isn't a single true waifu for me here. That said, Hanako might fit. I could see myself being able to not amplify her problems.
Final pick: KS!Hanako