I mean the seven-tailed one from Waterfall Village, though finding her would be a pain in the ass even with my sensory capabilities, which are not necessarily transferable with a cast of consciousness into a new body. There's not much you can do when you can sacrifice a doll without much regret or fear that the trail will lead back to the creator.
With my iryo-ninjutsu skills, it's not that hard to change facial features, and chakra sensation will change with the removal of the soul from the body, while the connection of spatial seals can't be traced even byakugan, not to mention other dojutsu. Of course, there are some doubts about Nagato's rinnegan, but he didn't seem to have demonstrated the ability to manipulate space-time.
By the way, a strong enough shinobi with no ties to a village has a chance to get an invitation to Akatsuki after the civil war in Amegakure is over! And then I won't have to go looking for that freaking black Zetsu! I mean, I have about ten years to create the strongest puppet possible and give it a chance to gain fame in the international arena.
That's how famous noukenin like Sasori, Deidara, Kakuzu, and Orochimaru got their invitations... Hmm, I need to think about this idea carefully and look for ways to get rid of the black stuff instantly, even at the cost of the doll's life.
The only thing that comes to mind is instant sealing upon touch and instant teleportation (or callback) from the scene of the crime to a prepared location. It's a long shot, but given the stakes, it's worth a try, since the fake Zetsu can't be reached or detected by conventional methods, judging by his extensive but very successful espionage activities.
Over thinking and planning for the future with the soon to be changing capabilities available to me, I completed a comprehensive seal drawing, checking against the notes, taking a little over an hour to complete.
Checking for errors, I nodded and taking the prison scroll case from the shelf, extracted the first test subject - if all went well, no more would be needed. Placing the dark-haired boy's naked body on a paper with a faintly chakra-glowing ink of complex fuin, I created a kage bunshin with a decent amount of chakra and nodded invitingly, retreating to the far corner of the basement under the protection of a powerful kekkai - I wasn't quite crazy enough to test such dangerous things on my own.
The clone grimaced, giving me a disgruntled look, but knelt down and touched the seal, injecting chakra. The drawings under the body flared and for a moment nothing happened, but then, as if with a kick, a ghostly copy of the motionless guy popped out and almost immediately disappeared, and the seal completed its work.
- Examination! - I immediately ordered the doppelganger.
The kage bunshin was already examining the presumed corpse with shosen no jutsu.
- Brain activity is suspended as in a coma and the heart is gradually slowing down, - he reported, - native chakra in the body is present, but the source of new chakra does not produce and fades quite quickly, we have about seven minutes to do everything before the body finally went to the state of a corpse!
I've got more interesting stuff on patreon (+ 200 chapter)
patreon.com/Chill76