One Piece: Supreme Check-In System - Chapter 44: New World

Ryan «Quicksave» Romano is an eccentric adventurer with a strange power: he can create a save-point in time and redo his life whenever he dies. Arriving in New Rome, the glitzy capital of sin of a rebuilding Europe, he finds the city torn between mega-corporations, sponsored heroes, superpowered criminals, and true monsters. It’s a time of chaos, where potions can grant the power to rule the world and dangers lurk everywhere.

A heroine character transmigrates and gets busy expanding her golden halo of MC-ness.

A villainess character transmigrates and gets busy changing her cannon-fodder fate.

A side character transmigrates and gets busy stuffing her bottomless stomach. She holds a divine sword in one hand and a little bun in the other. She’s obedient, adorable, incredibly clueless, and frustratingly tightfisted with her words. So what does she do when she spies a cute blonde?

Feng Wu: “Please marry me!”

Ming Xi: …

A hilarious story about an overpowered airhead in a world reminiscent of Coiling Dragon. This particular tale has an interesting mash of tropes.

- Description from Novelupdates

As a promise, he went out into the world as an assassin. 3 years later, after becoming the Supreme Assassin, he gave up on everything he had and returned to the ranks of ordinary people. But one day, Kismet, a mystical game created by the National Research and Development had appeared.

Enigmatic hands, spectral frame, and one cunning strike just like the swing of the Grim Reaper. The Supreme Assassin takes on the mystical world, and how his legendary tales sets off, progressively ascending the altar to becoming the best.

- Description from Novelupdates

A loner boy, who’s always loved escaping into his RPG world, suddenly finds himself living as one of his game characters. But instead of becoming his favored fighter, he’s in the body of his second avatar—a support mage! Though he’s used to playing both roles, being the mage in real life is a whole new challenge. Now he must rely on his knowledge and skills to navigate this unfamiliar reality and survive as the game's “support.”