The supporting character's harem is very normal - Chapter 477 Cooperation

Lee Seongjin, the strongest hunter who defeated the demon king.
He possessed the body of the pig tr*sh Third Prince, the Holy Imperial Family’s shame.

But the members of this family… there’s something strange about them?

‘Overpowered’ Holy Emperor.
‘Regressor’ First Princess.
‘Player’ First Prince.

Lots of trouble and lots of words
The story of the Holy Emperor and his children.

Akari Nakamura isn't what anyone expects from an S-Class mage.With her stylish fashion and an attitude bigger than her platform heels, she's used to being underestimated. It comes with the territory. But after scoring the highest marks ever recorded on the Arcane Assessment Test, even Crescent Moon University's stuffiest professors can't deny her raw power.Too bad they're going to try anyway.As Akari navigates a world of old money and older magic, she discovers that the university's prestigious facade hides an ugly truth: they're systematically undermining students who don't fit their “traditional” image of what a mage should be.To win here, she'll have to make some powerful enemies and prove herself every step of the way.Oh well. Just another day in the life of the S-Class Gyaru!---A light-hearted yuri/futanari GL novel!

“A cheat system? Do you take me for a fool? Nowadays, where can you find such a good thing falling into your lap? Scram from my head. Is this is new kind of fraud? Or is this a murderer training system of aliens that contains the ability of hypnotism?”

“No, I am the chaos that whispers from nothingness, the nightmare of all living beings in the Southern Ten Stars, the successor of the unparalleled God and… your elder sister.”

“…I only have a younger sister, I don’t have an elder sister!”

“No, you have one. I am an illegitimate daughter. It’s just that your dad didn’t inform you.”

- Description from Novelupdates

The Interstellar Fleet from the game appeared before the ordinary youth, Bai Zhongqi, and the player became the Chancellor of the Empire, opening a new chapter for his brethren and Earth as they set out for the vast sea of stars. The nations of Earth were engaged in cunning and fierce competition for the future of the Intergalactic Era. Bizarre and varied alien civilizations were waiting for Earth’s explorers to discover them. It was a cruel, dark jungle where only the fittest survived, and a world filled with opportunities and magnificent adventures. But for Bai Zhongqi, this was simply a laid-back story about leading Earth’s friends, furiously climbing the tech tree, beating up aliens, and dominating the Galaxy.