Absolute Choice
A world filled with heroes with superpowers. A world attacked by calamity fiends. A modern world filled with wonders and dangers. Shi Xiaobai, a child from normal Earth, walked into such a world, proclaiming to be its king. But at the first signs of danger, he is forced to make a choice, one which he cannot refuse for time would repeat, making him face the choice again. He is not humble nor is he modest, but neither is he delusional. Yet, the Absolute Choice seems to make fun of him. Will the joke be on him or will he laugh at his opponents? There will be many watching his escapades, and there will be some joining him in his adventures. To see through the world and to grasp its truth, that is the destiny of the King.
How about Ten Years of Confinement
"If possible, Time and I are willing to transfer all our powers to you, allowing you to gain extraordinary strength in a short amount of time.
"Unfortunately, the inheritors of our powers have also been scripted by Fate. Fate does not react to minute changes in the details which is why even though you who come from a different world and have non-zero impact ten thousand years from now, the changes in the script that your strength can cause is negligible. It is why Fate has been ignoring your existence all this while.
"But if Time and I were to transfer you our powers, making you the world's strongest person by our excessive anxiety to strengthen you, the script will change drastically. Fate would no longer sit idle as a result. When that happens, Fate might even personally take action to wipe you out of existence.