(Real quick fun fact before you read the ideas I've put down, did you know that in the Naruto Wiki, they put Kurama's species as Kitsune. And since Kitsune are typically seen as women... it canonically means that Kurama is more than likely a female. Let that sink in for a bit.)

Doflamingo Uzumaki (One Piece x Naruto): Doflamingo died when Luffy struck the final blow. Accepting his death, he still smiled to the end. Going towards the light, he suddenly found himself as a newborn laying on a small bed with candles around him and two people saying their goodbye's to him.

Joy Boy The Loud (One Piece x TLH): Lincoln Loud was a boy who yearned for freedom. Freedom to do what he wanted. Freedom to laugh and cry. But he was stuck with his family, being their good-luck charm. Yet, one day, he got what he wanted and changed his name to free himself of his shackles. He was now Joy Boy... and this is his story.

The Wandering Ronin (Naruto): When Naruto was 5, he was chased out of the village. After wandering aimlessly for days without food or water, a man saved him. His name was Mifune and he took the young Naruto under his wing and taught him the way of the Samurai.

All for Loud (BNHA x TLH): Lincoln Loud was a boy who through the world had abandoned him. He felt as if God himself left him for dead. His family, a family with all kinds of quirks, kicked him out for being Quirkless. But he soon finds a way to japan is adopted, with a little brother. Years later, his second family is gone, his little brother and his successors, his enemies. His name is now Shigaraki. But the world knows him as All For One.

4 Hearts, 2 Bags of Cash, and A Loud (Naruto x TLH): Lincoln's family is going through hard times, so Lincoln leaves hoping that they would do better without him and so he can get money to help. But he ends up getting some help from an old scroll and a dead man.

Crocodile The Brother of Gaara (Naruto x One Piece): Crocodile dies in the Marine Fort Arc, fighting Akainu saving both Jinbe and Luffy. But that was not the end of it, as he soon finds himself in a desert in the body of a child and surrounded by wolves.

Smoker's Chance at Peace (One Piece x TLH): Smoker, after serving the Marines for so long, dies in his sleep after saying his goodbyes to both his men, his apprentice, and Luffy. Yet, he wakes up as a twin to a blonde-haired girl and his name is now Loker, which was pretty stupid compared to his new sisters' name, Lori.

The Uzumaki Sith (Star Wars x Naruto): While running away from a mob, Naruto falls into a sinkhole, landing on an old metal ship and inside, a whole bunch of red cubes with a strange metal man who was guarding them.