Yep, I've decided to not add a last name (or first name, whatever). His name is simply Feng. 

MC of this book. An average college student who got sent to the world of Teyvat by truck-kun. Together with him is a little potentially-world-altering addition called the Block System, granting him the abilities of a Terraria adventurer. 

He desires simple things: go back home, build his home, and save the people he cares about. For those desires, he is bound to travel across this entire world.

From Liyue to Mondstadt, from Natlan to Snezhnaya, Feng would walk through each of the seven nations, perhaps multiple times. 

From the Archon War to peace, Feng shall also move through a length of time that he has never prepared for. 

Even if he is in a different world, even if he now has power beyond anyone in his previous life, even if he has been estranged from everyone he has ever known, Feng never allows himself to forget this one thing: that he is, indeed, a human. 

Corcell is the Archon name, or the Goetic name.

Krystallos is the human name: Greek for "Crystal", meaning "coldness drawn together"

An Archon born within a storm and transformed her birthplace into a city that's floating on the clouds and carried by the winds. 

In her Cloud City, Corcell is called "Chatelaine", an honorific title. 

Being the Cloud Archon who can control four types of elemental power simultaneously: Hydro, Cryo, Anemo, and Electro, Corcell has always been a force to be reckoned with. However, she has chosen to take her people into the sky and away from the worldwide conflict known as the Archon War. 

When her city encountered the presence of cosmic horror, it eradicated all of its defense and weakened Crocell herself. The Lunatic Cult's attack followed the disaster, and the Archon was stuck down to the earth where she encountered Feng. 

The Block System manifested within Feng's mind as soon as he woke up in the World of Teyvat post-reincarnation. It grants Feng an interface that's very similar to that of Terraria's inventory. 

Inventory space, armor slots. accessory slots, cosmetics, etc. 

The System isn't a complete replica, however. 

For example, the delete button is not present, and the Power Menu does not appear to be working properly. 

While this power is based on the videogame Terraria, Feng will soon discover that not everything is like the games he knew. 

As far as it goes, Feng has come to learn that this Block System is his primary way of powering up.