MTL - One Piece: The Soul Purchasing Pirate - Chapter 699 In my name

A man is reborn into the world of Avatar: The Last Air Bender as a waterbender from Katara's tribe. Best of all, he was the same age as her, and he had a system with him to help.He knows the future and a system that lets him continuously get stronger by completing quests or long-term missions, as well as giving him the ability to copy abilities from others for himself. He will become invincible in the world of Avatar, even more so than the Avatar himself.

Ryan Carter, a die-hard fan of Russell Westbrook, tragically dies in a car accident after watching one of Westbrook’s most electrifying performances. But death isn’t the end—it’s the beginning. He awakens to find himself chosen by the mysterious Basketball Soul System, granting him a chance to be reborn in a parallel world with the abilities of any current NBA player. Without hesitation, he chooses his idol: 2016–2017 MVP Russell Westbrook, in his prime triple-double form.Now reborn in the basketball-obsessed world of the ABA, Ryan joins the Iron City Roarers. With unstoppable athleticism, relentless energy, and a hunger to win, he begins carving a new legend—one fast break at a time.

The whole world is subjected to a highly dangerous standardised exam called the Global University Entrance Examination. Answering questions by putting their lives at stake, they would live if they passed the test. Every month the exam will undergo reformation while, occasionally, it is random.

- Description from Novelupdates

In the Abyss, all beings are imprisoned, struggling bitterly to survive. One day, in the eternally dark lower world, a young boy has a chance encounter and catches a glimpse of the upper worlds. He is fortunate to witness wonders beyond even the most beautiful dreams. Realizing there are worlds beyond his own, he refuses to settle for mediocrity and vows to ascend to the top step by step.