The guy who made that acting like every one piece villain hasn't come back as an ally at some point
Talk no jutsu would work on every OP villain just fine
Lets see... only main villains:
Buggy... probably would work if u talk with him about his dream, he is very emotional aboutvit
Crocodile also is similar to obito, he lost hope. Could've got it back and did got it back with same way talk no jutsu does it
enel wouldnt work i think.
Lucci wont work
Would work on moria
Bonus: Would work on hancock
In marineford luffy didnt have an specific enemy so idk but wouldnt work on akainu, for now
Wouldnt work on hody, he was flat out racist
Wouldnt work on doffy
Would work on katakuri, kaido, and kizaru