Does anyone know of any manga where a girl comes out of nowhere and starts living with a guy? If you do please message me

Till now i have found that only 2 things are infinite:
The Universe
Human Stupidity

Sounds like you want to read Midori no Hibi.

Does the walker choose the path, or the path the walker?

Haru Yo, Koi
Love Hina is basically the opposite of that
Sekirei
Elfen Lied

Glados is a bitch. She made me kill the companion cube, the only friend I'll ever have. 😢

Chibidoro-sama=Neko-freak

SaiKano although I doubt it's anything like what you're looking for. Video Girl Ai is one by the mangaka of I''s, I've only read to vol. 3 but it looks good so far.

At least half of the harems ever made are either that or the reverse.

REC (significantly better than the rest of the suggestions I'm posting)
Pastel
Maburaho
SPAS-PA
Kannagi
Parallel

I'm certain there are more, but I don't feel like looking.

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an oldy living game but very real
another oldy ah! my goddess moves in with girl and sisters, eventually

Maburaho I think

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Quote from xombiemonkey

Haru Yo, Koi
Love Hina is basically the opposite of that
Sekirei
Elfen Lied

Wow Haru Yo, Koi is one that I actually haven't seen you post in every suggestion thread.

Second to REC

I would also say Nagasarete Airantou and Seto no Hanayome

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Video Girl A.I. is made of win! Good Morning Call is kind of what you're looking for. It fits the pattern. A girl and boy move into the same apartment after a mix-up occurs at the real estate agency or some such. In case you haven't read it I'd suggest you read Fruits Basket. To round it out, Love Monster and My Balls. Both are ecchi, but My Balls takes it to an extreme and hilarious level.

Sarcasm just doesn't work over the internet.

dears

Good Morning Call - literally out of nowhere suddenly the girl lives with a guy
Missile Happy!

I loved DearS

Till now i have found that only 2 things are infinite:
The Universe
Human Stupidity