Reverend Insanity if you're okay with the girl(s) only being around for 10 chapters.
Haven't read it myself, but based on the title, Strongest Abandoned Son seems to fit well.
The Universe's Ultimate Boss and God Level Demon turns the hatred others have towards them into strength and I am a Scarecrow and the Demon Lord...
Universe's Ultimate Boss and God Level Demon take joy in laughing at the misfortunes of others.
Universe's Ultimate Boss is really similar to God Level Demon and has a similar setting.
There aren't too many novels with 1500+ chapters, so you might be able to get away with just sorting all the books on the site by chapters and...
It's also unfortunate that most of the good ones haven't been translated.
Also Mystical Journey, but imo that arc was the worst written part of the book.
Sounds like it's time to read a cultivation novel with a female protagonist.
Also, Reverend Insanity and Lord of the Mysteries if you consider...
Way of the Devil and Mystical Journey
Make sure to read Mystical Journey first because you won't be able to enjoy it after you read Way of the Devil.
Would Lord of the Mysteries count?
Klein isn't a real mage and a pistol from the 1800s isn't exactly a modern gun, but it's close enough, right?
My Disciples are all Villains is decent and Way of Devil might count if you consider a system that only upgrades skills as a system.
He's big because he eats grass.
If you take the blue pill, your life will stay as it is. You will wake up, read the latest chapters, and look for translated novels. But if you...
God of Games does do it much better, but it's discontinued at 404 chapters. Legend of the Black Dragon devouring the stars can be considered above...
Lord Xue Ying can create 10081 bodies. Don't ask me how I remembered.
I've only read legend of the Black Dragon Devouring the Stars and Game of the World Tree. There comes a point where you no longer have any brain...
RI is good, but it's not exactly what I was looking for. Ascending the Heavens as an Evil God sounds great though!
I want a smart protagonist that has an incentive to use his power to abuse, exploit, and maybe exterminate the weak, like God Level Demon and the...
Those are rare, but maybe Three Body Problem?
Separate names with a comma.