can you no just resurrect them you have sasukes power knowledge along with orichimaru sasuke at his prime had rennigan one of its power is literally resurrection of the dead for a price but with magic you might be able to cheat
how about dxd just thinking about those prideful arrogant parasite reduce to slave of second class citizen and there ego utterly shattered makes me so happy inside
technically he's no longer the same mc as before his soul merge with the real emperor and completely overpowered it heck ge barely remember his past live so he is practically the real god emperor of mankind
orihimi isn't weak his ability is one of the most overpowered ability in bleach the problem is orihimi herself she wasted her potential the ability to reverse time Is overpowered
you have all for one you can just give them copy of some of your powers or just unlock and teach them nen like the original all for one to gain loyal subordinates especially if you consider the are desperate for power to survive