First Legendary Dragon: Starting With The Limitless System - Chapter 1: Showing Middle Finger to Dad

Dante is transported to a brutal fantasy world with zero status and no combat ability.[DING!][You have unlocked a unique skill, [Summon Creation]][Ability to summon the 453 characters you have created in all the games you play. Each character retains their original stats, personality and abilities.]Desperate to survive a goblin horde, he reaches for his Level 99 god-slaying Paladin... but his mana is too low.Instead, he summons Shivvy, a Level 3 Rogue he once created for a five-minute task and forgot existed.Dante soon discovers the terrifying truth: All 453 of his summons are fully sentient... carrying the exact personalities, builds, and backstories he designed...And they all revere him as their divine “Creator.”Now, this “Creator” must level up from scratch.Dante must earn enough mana to unlock his summons.And managing the dysfunctional and overpowered family he himself built.

He rose from abjection and achieved eternity in glory.
He embraced the prettiest beauties and killed the strongest opponents.
He was able to shift the clouds into rain and cover the sky with one hand.
He could overrun the entire world and go anywhere as he pleased.
He pacified wars and held the world in awe.
He was matchless in the world.
However, his hair turned white overnight for his beloved woman and he was on the verge of death.
He was surrounded by enemies who were trying to take his life.
He struggled his way to become mighty and fought for everything he cherished.
For this age, he was the only king of the Dark World.
His name was a byword for might.
As a man living in the world, his only ideal was to pursue brilliance.

- Description from Novelupdates

You thought being reincarnated as an extra-side character was bad? Imagine being thrown into the body of a villain who is disowned by his own family and discarded by the author.

On his usual way to home Mikado Tsuchio fell into a hole that suddenly opened on the ground. Just like that, Tsuchio falls in a different world, he lands on a Grappler Wyvern and manages to tame it.

Tsuchio decides just like that to live in the other world, the reason for his quick decision: he wants to make a monster girl harem.