One Piece: King of the World - Chapter 4 - : Looking for Claudius?

A boy from 21st century Earth, met an accident and later was reborn in Naruto’s Ninja World.
He is born in Uchiha Family and becomes the useless brother of Itachi Uchiha and Sasuke Uchiha…. Let’s see how he changed the Naruto world.

- Description from Novelupdates

A wonder falling down from heaven! A boy possessed by strange blood! Gods tremble! Demons flee! A boy from the land of Dong Zhou. A pink skull as his sworn friend until death. A story of a determined warrior struggling for power. A legend that shakes the galaxy and disturbs the worlds of god, demon and man.

- Description from Novelupdates

Viay, an ISRO scientist, gets reincarnated in the Vijayanagara Empire, which has not yet weakened but unified South India in a parallel Earth similar to the current one, with slightly altered people and events in the 17th century. Watch how he guides the ancient nation back on the right track again.

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Due to the mercilessness of a wicked God, the Demon Queen’s Soul is sliced in half, reincarnating twice in her third life! Unfortunately for her, one of her halves reincarnated as a Living Armor inside the depths of a labyrinth!

Reincaranted not as a Living Being, but as a Living Armor, an Undead Ghost inhabiting a set of rusty armor, she will have to survive within the depths of the labyrinth as a Level 1 Monster!

However, as the former Demon Queen, she will destroy each challenge that dares come her way by relearning all the abilities, skills, and spells that she once held as the Sovereign of all Demons while merging them with the unique powers of an Undead!

As she rediscovers her previous life powers and knowledge, she begins to build a Demon Kingdom from zero, gathering strong allies and going against the Nations that had deemed of Demons, Beastmen, and Monsters as unholy existences!

...However, a dark shadow looms on the horizon, creeping slowly towards her future as she unravels the mysteries of the world and the gods that govern it.

And amidst the chaos of her third life, where could her other half had reincarnated?

Ruthless against her enemies, and compassionate towards her people, she shall reform the Heavenly Laws set by the Gods themselves!

This is the story of the weakest Demon Queen, who has sworn to never commit the same mistakes of her previous lives, and now, she will become the strongest!

An exciting action-filled adventure with Sci-fi, Necromancy, Magic, Fights against Gods, and Kingdom Building!