In the MCU/Marvel with the Omnitrix/Ultimatrix - Chapter 61: Ultimate Adapter

I, the mighty Telepath Starlord, got banished into the mortal world. The days in the mortal world are much better than those in heaven! Everything is here — money, authority and most importantly stunning beauties! I am from a rich family. Yes, I am indeed wealthy now. The kind of wealth where you would not want to displease me. Domineering CEOs, military big shots, business geniuses, you name it — I know them all! I know everything you are thinking about. You can’t defeat me anyway, how are you going to go against me? A century in the mortal world is only equivalent to a hundred days in heaven.
As an urban banished immortal, I will enjoy the heck out of my time in the human world and a huge commotion would arise in heaven!

- Description from Novelupdates

Traveling to the world of Hokage, Kamiyo Colt witnessed the chaos of the Nine Tails firsthand.Without any special powers initially, he planned to develop quietly and survive until the Infinite Tsukuyomi. However, when he first trained his Chakra, his system finally activated.The system's rules were simple:By healing others, he could gain random attributes and skills.“Heal Uzumaki Naruto to receive pure Ashura Chakra!”“Heal Uchiha Shisui to gain his bloodline talent!”“Heal Sasuke Uchiha to obtain pure Indra Chakra!”In this way, Colt steadily developed his abilities over more than ten years.During the Fourth Ninja World War, when the ninja coalition saw him suddenly knock out the Six Paths Madara with a single punch, he looked innocently back at them.“What? I'm a medical ninja. Doesn't it make sense to defeat him with one punch?”

Ye Yang, a straight man from Northeast China, transmigrated into a novel about court fights, became a concubine, and was bound to a system, which could put on view the favorability score of the main characters.

On condition that the emperor’s favorability score was too high, he’d fall in love with Ye Yang. However, if his favorability score was too low, he’d be mercilessly killed. In order to protect his life and chastity, Ye Yang forced himself to create his own persona, repeatedly switching between the personality of an unrefined man from Northeast China and the first beauty of the harem.

Yet, things were getting worse and worse. At first, he let the favorability score of the dog emperor drop. Later, the score began increasing rapidly. Watching how the favorability score was about to skyrocket, Ye Yang panicked.

He wore a gold chain and raised a mink, silencing all of the imperial concubines of the harem. Feng Luan’s favorability score had been increased by +1.

He had a snowball fight with the dog emperor and pushed him into a snowdrift. Both of them caught a cold. Feng Luan’s favorability score had been increased by +10.

The mink he raised thought out a plan for Feng Luan to renovate the imperial study room worth of more than 10.000 taels of silver. The imperial study was so horrible that one could hardly bear to look at it.

Feng Luan’s favorability score had been increased by +100.

What’s going on! Are you still a straight man!

……

The longer Ye Yang lived in degradation, the more he felt that the dog emperor was different from what he initially thought.

At his feet the ground was covered in blood and bones, but behind him was the delightful scenery of the prosperous world, and the coming of all nations.

A few years later, he helped Ye Yang up the stairs and gazed into the distance. He saw a myriad of twinkling lights, bustling, bright and beautiful.

And Feng Luan whispered in his ear.

“My dear Imperial Concubine, look.”

“This is our country.”

- Description from Novelupdates

A man who was once called the world’s strongest agent ended up becoming a teacher after his retirement, to train a new generation of agents. After many years of training his disciples, he was killed at the age of 60 by a secret organization’s ruse and was reincarnated in another world with his memories intact. Though he was surprised by the existence of magic and the strange species in that world, he quickly adapted to his condition as a newborn and took advantage of it. He acquired special magic and gained a massive amount of strength thanks to his rigorous discipline, in order to reach his goal: Resume his career as a teacher which he left halfway through in his previous life. This is the story of a man, who, based on the memories and the experiences of his previous life, became a teacher who travels through the world with his students.