You should have him learn demon magic from dbz and the techniques of the Kai's for example Kai kai because come on, who wouldn't want to use kamehameha and instant transmission amiright?
Also thanks for posting another story 🙏 love your works
How about mana core from the beginning after the end or touki or senjutsu or haki spear techniques and skills from the hero return or Shinsu from tower of god or the end from madoka box etc etc seriously there lots fiction powers out there that can be useful
¿Por que no aumenta su estadística de suerte o varias abilidades?, suan un poco masóquista que le apresca un ser random que podría acabar con el, en cualquier momento.