One Piece: Grand Line's Apex Parasite
Transmigrating into the world of One Piece would have been dangerous enough.
Transmigrating into the body of a talentless nobody in Shimotsuki Village was even worse.
Kai knew exactly what kind of world he had entered. Pirates, Marines, warlords, emperors, and monsters strong enough to decide the fate of entire seas. In a world like that, ordinary people were not heroes. They were casualties waiting to happen.
Worse still, Kai had no powerful bloodline, no overwhelming talent, and no strength worth relying on.
Then the God-Level Theft System awakened.
Three times a day, Kai could attempt to steal from others.
Talent.
Attributes.
Abilities.
Potential.
Even the gifts that allowed future legends to stand above the world.
Faced with a future of weakness and mediocrity, Kai made his choice.
If he could not be born extraordinary, then he would take greatness from those who were.
His first target was the green-haired boy training inside the Shimotsuki Dojo.
Roronoa Zoro.
A future swordsman destined to shake the seas.
But Zoro was only the beginning.
To change Kuina’s fate, survive the coming Great Pirate Era, and carve out a place for himself in a world ruled by monsters, Kai begins walking a dangerous path—one built on stolen talent, stolen strength, and stolen destiny.
From the quiet training grounds of Shimotsuki Village to the chaos of the Grand Line, every encounter becomes an opportunity.
Every genius carries something worth taking.
Every legend becomes a stepping stone.
In a world where talent decides destiny, Kai possesses the one ability capable of rewriting both.
Uki_0_0 · Anime & Comics
The name included one man army. but it seems 2 parasites already added to story at the level of chapter 30. So change the name into one man two parasite army. if you add more parasite then one man many parasite army.