God_of_Fantasy

Izumi: "Now, Everything in this world means nothing to me." Then, Izumi exiled himself to the ocean and made a home there, hoping that Kyouko (or her reincarnations) would return to him no matter hundreds, thousands, or even tens of thousands years (because he can literally become dragon after mastered Dragon Force).

Nephalem Dragon Emperor

Arifureta, before hajime and his class summoned in another world

I prefer Arifureta world because it's males more sense with this whole 'shadow monarch and his shadow army and monarch' thing.

Give him yami-yami no mi, then take goro-goro no mi and kaze-kaze no mi for his chakra elements because yami-yami no mi can use (absorb) other devil fruit power.

It is