Overpowered and Really Cool MCs

Reincarnation(?) ~ Rebirth with powers (?) ~ idk how to classify it.

10 years ago, after “the Gate” that connected the real world with the monster world opened, some of the ordinary, everyday people received the power to hunt monsters within the Gate. They are known as "Hunters". However, not all Hunters are powerful. My name is Sung Jin-Woo, an E-rank hunter.

Not only is it a great read but the art is amazing.
Mc is OP asf and the light novel is great (go read it)

Reincarnation ~ Isekai

King Grey has unrivaled strength, wealth, and prestige in a world governed by martial ability. However, solitude lingers closely behind those with great power. Beneath the glamorous exterior of a powerful king lurks the shell of man, devoid of purpose and will.

Reincarnated into a new world filled with magic and monsters, the king has a second chance to relive his life. Correcting the mistakes of his past will not be his only challenge, however.

Isekai ~

Protagonist Kin Han Soo killed the demon king after 10 years of being summoned in the fantasy world. Now it's the time to be sent back to the earth. What this? the fantasy worlds god appears along with his report card. Because he removed all the obstacles that prevented him killing the demon king, his personality score came out as F.

Mc just breaks all Isekai rules and traditions while not giving a damn (and getting away with his bad intentions lol)

Game World ~

The man forsaken by the world, the man a slave to money and the man known as the legendary God of War in the highly popular MMORPG Continent of Magic. With the coming of age, he decides to say goodbye, but the feeble attempt to earn a little something for his time and effort ripples into an effect none could ever have imagined.

Art changes a lot, I’m personally not bothered by it but...just so you know.

Time travel (back in time) ~

He was an addict, a loser, a despicable human being. But, one fleeting dream that may not have been a dream at all reawakens his once-lost senses. Possessing a unique ability, he would use that, and the dream, to forge his path in the world now known as the Lost Paradise.

Reincarnation~

The first life. After a tragic accident losing his family and legs, he ends his own life. The second life. He earned fame as the Red Demonic Master in Zhongyuan, but was betrayed by the man he trusted the most. And now comes his third life. In his life back in the modern world, Gang Jinho decides to live a normal life... However, he was too used to the Zhongyuan life to become a normal person! 'I wanted to live peacefully. But you are the ones who started it.

Game world~

The main character, striken by rare disease that only two people in the world has, where it makes one bullimic.

He organizes his daily meals to survive day to day, but his hope of survival gets dimmer each time.
By the doctor's recommendation, he started playing the Alternate Reality Game 'Athens' where he can eat as must as he wants without getting any fatter.

Playing the game to save his life and growing in strength just by eating! A Gourmet Fantasy Life!

Isekai~

" You have been selected as the fittest"
" With your talent, the survival rate [5%] in the Selha Latna is lower. "
"Do you want to commit suicide? Y/N"
"X-"
Less than a 5% chance of survival. 22 years. Countless battles with the demon dogs. In this hell; I'm surviving alone.
Hidden behind level 5, together with the outrageous hidden stats!
The extreme survival record of the strongest level 5 swordsman Ryu han bin who was thrown into this oth

Time travel (from future to past)

The God’s Tombs started to appear around the world. Due to the relics within these tombs, many were able to wield these legendary power for themselves, while others became enslaved to these users. However, a Tomb Raider appears with the purpose of robbing these relics. The Tomb Raider King. “God damn it! Did that bastard already loot this place as well?!” What you own belongs to me. What I own definitely belongs to me.

Isekai ~

eon-woo had a twin brother who disappeared five years ago. One day, a pocket watch left by his brother returned to his possession. Inside, he found a hidden diary in which was recorded “By the time you hear this, I guess I will be already dead….”

Obelisk, the Tower of the Sun God, a world where several universes and dimensions intersect. In this world, his brother had fallen victim to betrayal while climbing up the tower.