I'm looking for a manga that contains a strong and deadly beautiful female. She doesn't have to be the lead but should be one of the major characters. Preferebly some kind of action manga

She is the kind of girl to stand up for herself and knows how to fight and isn't afraid to kill if necessary, all while still remaining an elegant lady. She has feelings and is generally kind but doesn't let anyone walk all over her of treat her like a doormat. She is after all a lady that should be respected.

She isn't a hot head or gets violent outburst, she is a mature women that can be vulnerable sometimes but will keep on fighting.

Asami Sato in Legend of Korra would be similair to what I'm looking for <3

weeell she is beautiful AND deadly, but she's also a secret spy
9 Banme no Musashi

there's also this manga in which the mc goes around seducing billionaires and leading them to their destruction all because of revenge. Thing is, the mc's a guy, so...
Ningen Gakubu

sorry I don't know anything exactly like what you're looking for

I kind of weird one that I read recently is Queen Emeraldas. It is a space opera written in the 1970s, and the main female is a deadly space pirate who believes in no mercy to her enemies.

Most of the time when I read a manga with a deadly and beautiful female she's also a hothead a lot of the time. Like in Spirit Circle and Basara. Or either just a good fighter but not really deadly, like the cool-headed and elegant female leads in Otoyomegatari and Song of the Long March.

Yeah, I don't know anything exactly like that (that comes to mind), but you might try Aлёша! if you haven't, it's kinda close (and very good) I think 🙂

Sonohara Anri from Durarara!!

Perverted (borderline) but this has a strong and deadly female lead. Gekkoh

Claymore
Saver
Angel Densetsu(Hilariously good)
Okoborehime to Entaku no Kishi
Superior
Seirei no Moribito
Ichi