I was looking for.........

Gothic Science Manga, similiars to D. Gray-man, Soul Eater, etc..

Shooting Action Manga, similiars to Black Lagoon, Jormungand, Gunslinger Girl, Dogs, etc...

known as Lucifer / Killy69 / Guts / L41n / Lain Iwakura / Schrö.

Gothic Science Manga;
Death Note, Misa is so Gothic.. 🤣
Superior, maybe.. 😕 The female heroine looks kind of Gothic..
Übel Blatt, maybe too.. 😕

Shooting Action Manga;
Emerald..

That's all I can think of, as of now..

source: animenewsnetwork

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Shooting Action Manga

Blaster Knuckle
Gun Blaze West
Kurohime

Gothic Science Manga

666Satan
Watashi no Messiah-sama
Zetman
Zombie Hunter

SeeYa

Gorath

You don't have a public list so I can't tell if you've read these but...

Dark Sciency
Abara
Homunculus
Mirai Nikki

Shooty Action
Battle Royale
Black Cat
Bakuretsu Tenshi

A bit of both
Battle Angel Alita
Elfen Lied

Gothic Science: Worlds
Shooting Action: haven't really read any myself

Gun Blaze West, and Emerald

I haven't read these, thanks.

Quote from Juneau

You don't have a public list so I can't tell if you've read these but...

oh sorry, I am lazy..

known as Lucifer / Killy69 / Guts / L41n / Lain Iwakura / Schrö.

Shooting Action Manga
Priest
Kilico
CAT
Karasuma Kyouko
Red Eyes
Tista
Trigun
Eden
Gantz
Blame!
Biomega
Until Death Do Us Part
XS

Gunsmith Cats: Shooty, Drivy, Actiony!

gothic-
tokyo akazukin
lots of gothic little science, alot of mature situations, reader beware
also action i guess.
if you like gore and children in inapropriate situations, then this is for you