Mugiwaratensa

He reminds me a bit of Kazuma from Konosuba.

They are just Eldritch versions of Gengar.

I understood something from now on the translator will not make any difference between a Reincarnated Devil and a Devil/Human Hybrid, it will call them Devil if they are at least partly Devil.

It looks like the grimoires in Black Clover.

He's a Half-Devil but he keeps calling himself a Devil so the translator must have gotten tired of changing it so he had to leave it like that, you know authors are known for being inconsistent especially Ch*nese authors.

Black Butler - Undertaker

Saekano: How to Raise a Boring Girlfriend

Kaguya-sama: Love is War

Shokugeki no Soma

Mieruko-chan