Unrivaled Tang Sect - Chapter 6.4: Number One Academy in the Douluo Continent

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.

Thanks to the so—called God, I somehow ended up as Uchiha Itachi’s younger brother and Sasuke’s twin.Wild, right?If I had to sum it up, I’d say, “Losing Shonen Jump is one thing, but losing your integrity? Now that’s a tragedy.”But let’s be real—none of that matters when you’ve got the Gojo System from the get-go. Yeah, you heard that right. From the moment I landed in this world, I was set to flex on the entire ninja world.And just like that, Konoha got itself a brand-new, utterly bizarre Uchiha.

Hogwarts is a strange place. The demon king who failed plastic surgery was eliminated from the job search. The white-haired old man wearing two layers of wool socks is still too cold in summer. The potion professor who never washes his hair is afraid of going bald, and the key keeper loves to play dragons!

William wanted to spend seven ordinary years, until that night, the door handle of the college lounge was stolen…

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- Description from novelbuddy

There was a Senior Brother and a Junior Sister. One of them was transmigrated to this world and had cheats while the other was the reincarnation of a Great Emperor.