low class devil
mid class devil
high class devil
ultimate class devil (Title 4 Satan DXD?)
Satan class devil (Title 4 Satan DXD Fanfiction?)
Superdevil/ god supreme / celestial dragon
... so there is DxD ..... the amount of braincells i wasted in trying to find where tf does this table fit in devils son in law, i was even considering the fact that maybe i forgot the cultivation system of that world