The NPC sets out to defeat the demon king - Chapter 20

After crossing over to Naruto World, Shiranui Yuuji found that there was an incomparably terrifying Godzilla in his body.

“You are Tailless Bijuu? Your chakra is astonishing…. What a coincidence, so am I.”

“You know Bijuu’s coat? I don’t have Bijuu’s coat, but I do have Godzilla Coat-”

“Bijuudama is terrifying!! It can destroy a mountain as soon as he sends it down?”

Hiss, that Bijuudama scared Yuuji, he quickly moved his hands to form seals,

“Nuclear Release – Atomic Breath!”

When Yuuji turned into Red lotus form, Godzilla pressed Nine-Tailed to the ground.

“Nine-Tailed, your strength is too strong. You need to be fried…”

Nine-Tailed, “?”

“What Jinchuriki are you exactly?”

He is a young man without a spirit root. It is believed that this denies him the chance at cultivation. However, a mysterious lady imparts a Supreme Demon Classic to him and from then on, he starts his path of cultivation.
He undergoes a total transformation to emerge as the most fearsome and powerful fiendish demon in his era, that even immortals and fiends are fearful of him, and saints are at his beck and call.
Mastering the Supreme Demon Classic is the turning point in his life. He is able to unleash his immense and divine power from within, illuminating the entire universe!

- Description from Novelupdates

Two years ago, Xu Xuan was the No.1 genius of the Xu Family and was rather famous among the young generation in Cloud City. His mother died of illness when he was a baby and he wanted to be father’s pride. That was why he challenged the person with the much higher cultivation in the martial arts competition.

Unfortunately, Xu Xuan lost. And his dantian was broken by vicious enemy. But he didn‘t reconciled at all. For the past two years, he had but he had persisted in cultivating every morning in the hope that there would be a miracle. However, there is not until he met the superior of Mysterious God Realm who was escaping. After a fierce struggle, Xu Xuan swallowed unique treasure Nine-Swallowing Divine Jade and obtained a low-grade Heaven rank cultivation technique Five Spiritual Arts.

Xu Xuan would never forget the scenes of how the marriage was annulled yesterday, nor the disdainful gazes of others, let alone their smiles after his dantian had been broken. What legendary road will this ordinary boy from the wilderness embark on？

- Description from Novelupdates

The days where adventurers would roam the land and grow strong are long gone. More than 99.9% of the world's population is level 1, and in fact, leveling just isn't something people think about anymore, as almost every spawn point on the planet has been gone for close to a thousand years. Only the elites, the super rich, or the super lucky have access to spawn points, and because of this, they are like Gods among men: like superheroes. For people like Zach, life is a mundane, ordinary experience of getting up, going to school, working, and then going back to bed. But that's all about to change when he stumbles upon one of the only unknown spawn points in existence. And in doing so, his life is about to descend into a wild chaos he never could have expected. (Lit RPG, fantasy, action, slow burn)