Toaru Majutsu no Index: New Testament - Volume 12, Chapter 1: Steamed Buns and Diamonds — to_the_DIANOID.

Noah Black, a young man with an abusive father who had no opportunities in life, condemned to live a substandard life because of his father's mistakes.

Noah Black from the parallel universe, a marginalized, obese young man with social problems and a somewhat problematic but loving family, but who couldn't live long because of the mistakes he made.

When Noah 1's mind enters Noah 2's body with a Gamer System, the path to becoming the biggest superstar in this new world begins.

Is that body fat? I work out with the system and in a few days I have the perfect body!

Is my family poor? With my knowledge of my other world, I can make easy money!

Is this face ugly? With System I can look beautiful without plastic surgery!

Do I sing badly? In a few days, the System will transform my voice into the voice of an angel.

Do I act badly? In a few days, the System will make me an Oscar-worthy actor.

I can learn anything I want!

“Rising to the top was like a game, and now I have become the Final Boss of the entire world!” -Noah Black.

Cultivators all have a soul beast, one that awakens at 13 years old.
However, Ye Chenfeng lacks one and is subsequently banished.
Ye Chenfeng obtains the favor of the heavens after years of humiliation.
With his gifts, he will walk his path to the strongest.

- Description from Novelupdates

Heaven Concealing Great Sage Xie Chuan was plotted against by his enemy. Trapped within the God Burial Valley, he found a supreme martial technique hidden in a tomb called Demon Refining Heaven Swallowing technique.

Millions of years after the betrayal, reincarnated in a direct disciple’s body belonging to a small sect named Cloud Mist Sect, Xie Chuan finally broke out and escaped from God Burial Valley.

“In my previous life, I had only concealed the heaven with my hands. This life, I want to refine demons and swallow the heaven!”

The heaven swallowing expert who walked out of God Burial Valley was just born!

- Description from Novelupdates

Kiyoshiro Takeda lived a life without purpose, drifting through his days with no direction. But one fateful moment changes everything. Now, he finds himself in a world unlike any he has ever known, given a role he never asked for. A new life, an unknown destiny, and a looming catastrophe that only he can prevent. But can someone who failed in his old life truly become the last hope?