One Piece: I Obtained the One Piece from the Start

[No System] [Moderate Harem] [Invincible from the Start, Starts Slaughtering Everyone in Volume Two]

A God of Death from another plane loses his divine powers amid a temporal upheaval and arrives in the world of One Piece, landing on Laugh Tale, where he finds the great treasure left behind by Roger. After seeing Fish-Man Island, he decides to make a name for himself there.

He takes Celestial Dragons as maids and steals their national treasure; recruits seven powerful subordinates and replaces the Shichibukai; overthrows the Celestial Dragons' rule and helps Straw Hat Luffy become king.

Reiju, an artificial human who ate the Swim-Swim Fruit, surpasses Magellan in strength.

Carrot, who ate a Mythical Zoan fruit, uses her “IQ” to fight an admiral.

Ain gains the demon sword Oboromuramasa, imbued with Mythical Zoan power, and grows stronger than Fujitora.

Does Xiya, an experimentally modified human, eat a Medical Fruit and become a mere tool?

Can three Artificial Devil Fruits, the Blue-Eyes White Dragons, merge into the strongest Mythical Zoan, the Blue-Eyes Ultimate Dragon?

A hodgepodge of elements: ninjutsu, taijutsu, and the Eight Gates from Naruto; experimental modified humans like Vegapunk's from Overlord; and a three-in-one combination of Blue-Eyes White Dragon Mythical Zoan artificial humans from Yu-Gi-Oh! The real Blue-Eyes Ultimate Dragon.