Classification:
1st–3rd Circle: Low Rank
4th–5th Circle: Mid Class (ordinary Devils not of noble blood)-(Young Noble Blood Devils)
6th Circle: High Class Comparable to Mature Noble Devils
7th Circle: Ultimate Class Devils : human magicians exist for this category
Or the Head of Five Principle Clan with each mythical beast they're only Ultimate because of bonded with them, because the gods of takimahagara deem it dit to control Japan side of humans.
8th Circle: Maou No 8th class maybe Merlin of he is alive no ...He's Dead killed by devils
F
9th Circle: Super Devil BTW only theorized for this
This and the og Magician is different one is using Merlin System the Other use Magic made by the devil Mephistopheles.One is for human the other is made in each other reference