I'm looking for a main female character with long black hair (and, if possible, blunt bangs).
Someone with the same aura as Sawako from Kimi ni Todoke or Sunako from
The Wallflower. (Hehe...their names rhyme 🤣 )

Any suggestions? 🙂

Nazo no Kanojo X she got a similar feel and somehow looks like you want her to, too (although her hair is a bit short - she let's it grow a bit longer later on I think, or was it the other way around >.>).
Can't think of any more...

furou kyoudai
tasogare otome X amnesia

best shonen manga couples :

shinichi X ran
natsu X erza
ippo X kumi
naruto X gaara

Othello - http://www.mangaupdates.com/series.html?id=1259

Kurashita Tsukimi from Kuragehime? 😛

Nadeshiko Club. Here's a sample page of her loong black hair with a blunt bangs.

maybe yuko from xxxholic

[img]https://c1.staticflickr.com/1/753/22668593615_519ce54b81_o.png[/img]

Jigoku Shoujo

[img]https://i.imgur.com/lHjrfaR.jpg[/img]

maybe you would like to try "after school play"
one of the character from fortune arterial also fits your description but her arc is not translated yet, so she doesn't have much appearance
Gas mask girl
Usotsuki Mi-kun to Kowareta Ma-chan Totteoki no Uso
sankarea

I'm adding Zakuro from Otome Youkai Zakuro... and I know there was someone else, but I forgot to add her on this list... sorry!!

You could try Kuragehime or Hinata from Naruto

idk if she has black hair but you could try Kurobara Alice

[img]http://i53.tinypic.com/2m6le7r.gif[/img]

There is also Arisu from Please Save My Earth.

I reread it recently so I immediately thought of her.

You can look through these.

[color=green]"Officially, this machine doesn't exist, you didn't get it from me,
and I don't know you. Make sure it doesn't leave the building."[/color]