Simultaneous Transmigration: I Can Summon Myself

In One Piece, he simultaneously transmigrates across the Myriad Worlds.

He can summon his deceased selves to fight.

Naruto's Uchiha Rein: "You want to dance too?"

The Legend of the Seven Swordsmen's Rainbow Cat and Blue Rabbit's Rein: "Please call me Young Hero Orange Cat!"

Jujutsu Rein: "There wasn't even a moment to mourn Saturn's death. The one who rushed straight to the battlefield was... Black Flash!"

Blazing Thunder Rein: "The moon is full tonight. Thunderous Crescent Slash!"

Kaleido Rein: "O key that conceals the power of darkness..."

Rein: "Warring States, I'll be the marshal. Who's in favor? Who's opposed?"