Sword Art Online - Vol 6 Chapter 7.2

In the age of the Great Liang Dynasty, the lives of the people were made convenient with steam-powered machines that run on a fuel named Violetstream Gold. Chang Geng, who lived in a small countryside village, shared a distant relationship with his mother while his stepfather was away most of the year round, and the only people he was close to were two little kids, the village teacher, and his yi fu – adoptive father. But his life was flipped upside down one day following the barbaric Man tribes’ invasion, and it turned out that his entire identity had been an illusion – not only was Chang Geng himself not the country boy he thought he was, but also his mother, his teacher, and even his beloved yi fu…

In a future timeline, the earth was visited by a species known as the Slarkovs.
Having lost their home planet and in search of a new one, earth was the next habitable planet for them.

Humans and Slarkovs made a deal with each other in return for the Slarkovs living on earth.
The Slarkovs traded their technology and knowledge for a new home.
They were similar to humans except for some of them who had slight differences so fitting into the society wasn't a problem.
Over the years Slarkovs and humans began to mate with one another and reproduce offsprings.
This in turn created a new species known as the mixed-blood.
Centuries later mixedbloods could tap into their bloodline and perform unimaginable feats.

Gustav born into an age where bloodline determines everything, struggles to fit with a useless bloodline.
His bloodline only grants him the ability to change his hair color, destroying his hopes and dreams for a great future.
His fate is turned around when an unexpected situation leads to him finding a system that grants him the power to unlock and upgrade bloodlines by completing quests but he's baffled by two quests with a five-year deadline. Success will grant him unimaginable rewards...
But only one thing awaits him if he fails... Death!

Follow Gustav on his interesting journey filled with unprecedented adventures, danger and death, maybe?

“Transmigrate as the Final Villain of the novel...” Ark stared at his reflection in the mirror he held. It was Theos Von Fallen, the final villain of his favorite novel.Although he was the final villain and the strongest in the novel, he was killed by the protagonist and his harem in the finale.[Ding. The Heroine Snatching System has started] Ark gave a crooked smile when he read the system message in front of him... “Exchange!” he shouted, unwilling to accept the fate they had in store for him.Trapped in the world of his favorite novel as the most “evil” and powerful villain, Ark, now Theos, will use his knowledge as a fan obsessed with the novel to take away all the protagonist's opportunities.Whether he can become the focus of the whole show or whether a script will dictate his fate, he will decide! He will live as a true villain who doesn't care about anything but his life and his loved ones.

Lin Rui was reborn, reborn in the year 4161, two thousand years later. In this era of highly advanced technology, where the peak of human biotechnology had collided and fused with the culture of Tianji Star, a new path for human evolution was born—’Zhi Zhuang Wudao’, capable of granting eternal life and transcendence beyond the universe. The entire society esteemed the strong, and it was considered an honor to practice Zhi Zhuang Wudao. There was even a group of ’Variant Walkers’ who stood at the pinnacle of the social pyramid, looming over the world with arrogance. At first, Lin Rui couldn’t fathom the meaning of his rebirth. He merely adapted to this era out of a sense of responsibility. It wasn’t until one day that the ’Battle Spirit Ring’, which had come into existence alongside Lin Rui, captured its first Battle Spirit. Lin Rui could let the Battle Spirit possess him for combat, and could also copy all the martial skills and abilities mastered by the Battle Spirit. The Battle Spirits he captured grew increasingly powerful— Lin Rui began to realize this era was his to own. A ’Super Abyssal’, who would overshadow the future, began his rapid development journey at the Tianji Star’s ninth base.