The supporting character's harem is very normal - Chapter 25: I found that rat

In a world torn apart by rifts that release dangerous monsters, Espers—humans imbued with powerful abilities—serve as humanity's last line of defense. But the power of an Esper comes with a price. Overuse of their abilities leads to dangerous corruption, a force that can destroy them from the inside out. This is where Guides come in: individuals with the unique ability to calm the corruption within Espers and restore their balance.Rowan Mercer, an S-class Guide, is one of the best in his field, capable of stabilizing even the most dangerous Espers. He has worked quietly behind the scenes, helping those in need, but his life takes a dramatic turn when he is called to work with Lucian Vaughn, an S-class Esper whose immense power and unstable corruption levels make him a dangerous threat to himself and others.Lucian, a tall, stoic, and enigmatic figure, has long fought against the growing corruption within him. At first, his relationship with Rowan is purely professional—Rowan as his Guide, helping him to stay in control. However, as their interactions grow more frequent, their bond deepens in ways neither expected. What started as a simple duty soon turns into a complex relationship where power, trust, and vulnerability collide.As the world around them faces escalating threats from rifts, Rowan and Lucian must navigate not only their personal challenges but also the dangerous world of Espers and Guides. Their bond will be tested as they fight together against the corrupting forces that threaten them both.In Corrupted Bonds, survival isn’t just about battling monsters from the rifts—it's about fighting the darkness within themselves and finding a way to stay connected in a world that’s constantly pulling them apart.

The era of Universal Lordship has come to this world, bringing many opportunities and challenges for humans.At the age of eighteen, each person can acquire territory and participate in the Lord's continent, which will determine whether they can move into a vast world or die in mediocrity.Thousands of years after the start of this era Neo looked up at the sky waiting for his opportunity, the opportunity to change his life and move toward a grander goal.All lords choose an easy route and select a race that already exists but he wished to go against the current, so even if it was looked down upon he created his own race bravely and swore to fight tooth and nail for success.This is the story of his journey as he walks step by step toward a grander future.

One Piece World (Completed): On the eve of the summit, the Navy Headquarters urgently needs a large number of elite combat forces to deal with the Whitebeard Pirates that will attack the Navy Headquarters next.

At this time, Warring States thought of the man who once shined for a while.

“The former admiral, the man with the most potential to become a marshal!”

“He was with Roger, Whitebeard, on this sea.”

“But he was also the only general who made a big mistake and was erased by the navy.”

Recalling the past, Warring States fell into hesitation.

Whether to use him or not, this will make the Navy take great risks.

The World of Naruto (Hot Serial): Starting from becoming the younger brother of Golden Shining, starting from the night of the Nine Tails, subverting Konoha and subverting the ninja world.

Sarutobi Hiruzen: No one would have thought that the young man who had been mediocre for twenty years would possess a terrifying strength no less than that of his elder brother.

No one would have thought that Konoha’s golden flashes were two men!

- Description from novelbuddy

A young man with an extraordinary mind is off on an exciting adventure when he mysteriously wakes up in the body of a feeble slave-guy in a different, rich in quirks world.

The main character, a selfish jerk, would use extreme means to achieve his goals. However, he never allows his base instincts to overrule his sense of decency. He always pays back both good and bad deeds.

Will his (terrible/excellent) mentality help him make a fresh start? Will he get through misfortunes and hardships of the new world?