Travel through Naruto
Others are the second generation of rich people and officials, and at worst they can get a temporary residence permit in Konoha or something like that. Liu Yun was a rebel and a ninja when he time traveled, and he was disabled and had to wander around.
However, Liu Yun has a secret black market that can communicate with all worlds and conduct transactions with people from all planes.
"That red-haired Shanks, I have a mechanical left hand from Cybertronian. Do you want it?"
"Your Highness Sesshomaru, what do you think of this legendary artifact - the Soul Control Sword of Budou? What? I can't afford it. The price is negotiable."
"Lord Orochimaru, I have an elixir here that can repair soul wounds. What do you think? It's too expensive? For that, we can trade it with XX."
No matter how chaotic the ninja world is, Liu Yun just wants to hide in the money exchange and run the black market with peace of mind.
This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.