Best of the best

One of my top favorites
a human gets portalled into hell, and becomes the strongest demon lord after 10000 years. But then he comes back to his world where 5 years passed, now people with abilities fight monsters through portals. He has to absorb dark magic to get his old powers back!! Because some edgelord wants to turn Earth into new Hell!
GREAT, kinda evil mc
the art changed :( it's still good, but the first art style was better

One of my top favorites
evil dude gains the abilities/traits of any living organism he eats. he wants to be an apex predator but he gets killed, then he wakes up in an other world with monsters.
The story is GREAT! He's an asshole the entire time, and i love how he experiments with his powers. The story is also competed, but the ending is meh... I expected him to meet his son back on Earth.
VIOLENT, GORY, and immoral stuff

lots of philosophy, character growth, action scenes, and scary monsters.
The mc refuses to get tricked by the tower that appeared on Earth, and when his world is already destroyed, he just keeps fighting and going higher and higher through the system that creates towers. He wants to destroy all of it (to save/avenge humanity? the entire point is that he doesn't want to go back, and he'll fight for his present).
he goes everywhere and meets everyone, it's... a lot. world building i

One of my top favorites
Completed work! She isekais as the villainess, who's jealous of her sister (dead, rip) because she wanted to mary her husband (the male lead). But the male lead's love interest (female lead) isn't anywhere in this world, so what is she waiting for now that she married him?
my summary sucks, it's good

isekai story where she reincarnates in a dark novel as a homeless kid
the male lead (who's a dark wizard that eats evil people) uses her help to solve crime because she read the books and she's smart, and he adopts her into his family.

very funny! drama manga
a normal girl shifts dimensions one day by accident, in a world that works with the rules of manhwas (inso).
she becomes friends with the talented/pretty "main character" girl, and the other boys must be her love interest, right? ..right?
over the years, she opens up to them despite their culture diferences (manga/real). and she tells them about the dimension stuff, but not the manga stuff.

A reincarnator wants to work in the acting industry, so he decides to be a child actor to have an advantage in the future. He has the new ability to see himself in every camera lense, so he can look perfect in every shot.
Also, since he lived the future, he can protect his parents from being scammed and divorce, and knows where to invest his time and money.
The art is SO GOOD

When he dies, he can relive the same day. He's only a knight without great talent, but he puts all of his energy into training, and his efforts push him to get stronger and survive. It's really good, it might be one of my favorites right now.

this guy is a professional liar, he scams people with "constellations" (like awakeners) to get money. Then, a regressor dies in front of him, and the goddess who sent him back in time thinks HE's the regressor. The problem is, he's the villain who destroyed the world in the original timeline.