Emperor's Reckoning - Chapter 3: I am Lyon

Xia Yan passed through to the world of Bleach and became an eleven-year-old boy. He was rescued by Renji and Rukia in the Seireitei, and he was studying at Shin’ō Academy, and he was a student of the same class.
He is a top student of the Shin’ō Academy, and he is vying for strength by various teams. In the end, he has entered the first team of secret mobile maneuvers.
He will use punishment to kill every person who tries to threaten the martyrdom and protect his loved one.

- Description from Novelupdates

A mission for justice that spans across two lifetimes, a fresh beginning that presents a new opportunity to succeed where he once failed. In a time of grave peril for a world on the brink of anarchy, a hero rises like a phoenix from its own ashes to offer a faint glimmer of hope.Armed with his wealth of knowledge and experience from his past life, as well as an almighty cultivation art obtained under mysterious circumstances, Fang Che sets out to exact vengeance on the Church of the Self-Righteous, a blight on the entire continent and the ones that had put an end to his past life.Original blurb:The long night shrouds the world, and the dawn is delayed.Evil descends upon the earth, and living beings suffer.He wanders in the long night, strolling upon the edge of a blade, swaying between the clouds and hell.Igniting the fire of the star soul.Since the long night stretches on, I shall be the ruler of the night.

In an alternate modern world, where people could summon their own beastly companions, His journey was anything but ordinary.As the college entrance exams loomed, He found himself the subject of ridicule for his choice of a companion – a small, seemingly inconsequential snowball known as an ornamental pet.“”Little Snowball? Merely a decorative trifle, utterly useless.””“”Why bother with a pet that lacks the capability to evolve?””“”Its potential is pitifully inadequate. It’s destined to remain stagnant for its entire life.””“”Dreaming of the Familiar Academy? Utterly impossible.””He was bombarded with questions, scorn, and derision.But what they didn’t know was his unique ability – he could unlock the maximum potential of any Beast Evolution!With a calm demeanor, he gazed at the pet panel, visible only to him.“”Hidden evolution route!””“”Queen’s Path: a route of boundless potential. It can ascend to the regal King class.””From Little Snowball to Ice Crystal Soul, from Snow Girl to Ice Blue Girl, and ultimately, the formidable Extreme Ice Queen… the transformation was breathtaking.Now, armed with the power to unleash the fullest potential of any beast, he faced his doubters with a bold challenge.“”Who dares to call my Snowball useless now?””The stage was set for an extraordinary journey, where potential defied expectations and a small snowball could ascend to royal heights. Who would have the last laugh in this tale of evolution and triumph?

21st century kid got onto a virtual game 600 years into the future, with a freak combination of events gets to play as a NPC!

The first system job is to undertake the roles of helping new players create their character. Want to choose as one of the hidden race? OK, this is a slavery contract, up to you to sign it or not!

Entering the game as a player and creating a personal game character, the only advantage I have… The choice of selecting a powerful race!

Walking alone to the peak, bringing the present world to advance by leaps and bounds, the abnormal path starts from this first step!

- Description from Novelupdates