Resurrection Empire - Chapter 21 - 15: People in the City are Crafty

A con-man and policewoman that are legends of their respective professions suddenly die, then are reincarnated and return to the Tang Dynasty of ancient China as little kids.

Accepting their second chance and forced restart, they choose to use the modern knowledge and specific talents that they have in their previous lives in order to live comfortably in this new life.

- Description from Novelupdates

In the world of war games

Red Comet: “Amuro Ray, what kind of ability is it to bully recruits, come out and face me if you have the ability!”

Lin Youde shook his head: “What you’re looking for is Amuro Lei, what does it have to do with me, Li Abao?”

Go offline and return to the real world, to Konaku.

Lin Youde looked at the steel giant in Gnaku and couldn’t help sighing.

“Gundam is so handsome~!”

Correspondent: “Dr. Lin Youde, I have your sortie order.”

Lin Youde sighed: “Have it started again, stupid soul bound by gravity.”

Entering the cockpit of the red steel giant and opening the open door, Lin Youde said seriously.

“You guys, are you going to start a war again?”

“I just want to play games in peace!”

“Lin Youde, Gu Tie, attack!”

- Description from novelbuddy

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.