The Strongest Interstellar Commander - Chapter 91: Quatre Gone.

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.

Nie AnAn woke up one day and realized that she had transmigrated as the villain’s adoptive sister.

In the novel, the villain conquered left and right, and his always woe-is-me younger sister was always cleaning up after him. The two of them were rightfully the grim reapers in the book.

The very next day after her transmigration, the soft and delicious Nie AnAn passed out from seeing blood.

And so —

The shivering competitors noticed that their nemesis’s sister had turned to a delicious treat — and wanted to protect her;

The original male lead noticed that young Miss Nie, who had been chasing after him this entire time, wouldn’t even give him the time of day anymore — and felt unbalanced;

Young Master Nie was very happy that his parents had two kids back then– she was so GD cute;

A certain cold blooded and violent villain had been going home earlier and earlier, and the way he talked was becoming gentler and gentler.

Villain Brother: AnAn, come over. Let me try some of it.
Nie AnAn: Hold on, gege. It’s not ready yet.

- Description from Novelupdates

A fourth chance at life. The last chance.Zarek remembered when he first experienced the Godsfall Apocalypse. Those tears of red and sparkling rouge that split the skies, opening up one dangerous realm after another.That feeling of helplessness had been palpable, heavy... suffocating. It hung above his head like a guillotine, an edge graced by death's kiss...He grinned at it.One last ride, no Talents left on his stat screen, and nothing but a dull machete and his girl by his side. What was a better thrill than that?How could he possibly fail a fourth time?Unfortunately, there were others. Other Rebirthers. Some that might have been on their last attempt just like him, or some that still had more to give to this cruel world.None of it mattered, though. He had planned everything out meticulously, each life playing its own role.He would come out on top this time. How could he not?He was Zarek Ashborn.

The heavenly God of Warriors was betrayed by his true love and murdered at the very first night of wedding just because his merits made the monarch insecure. Reborn in a hundred years, Nie Tian would be an appendage no more. Reach the welkin, reverse the fate, reign over the heaven and reconstruct the worlds.

- Description from novelupdates