I- (Human child)
I (human Teen)
I+ (human Adult)
H- (Human Athlete)
H
H+ (Common Class Devil)
G-
G ( Low Class Devil 1st phase)
G+ ( Low Class Devil 2nd phase)
F- ( Low Class Devil 3rd phase)
F
F+ (Middle Class Devil 1st phase)
E- (Middle Class Devil 2nd phase)
E (Middle Class Devil 3rd phase)
E+
D- (High Class Devil 1st phase)
D (High Class Devil 2nd phase)
D+ (High Class Devil 3rd phase)
C-
C (Ultimate Class Devil 1st phase)
C+ (Ultimate Class Devil 2nd phase)
B- (Ultimate Class Devil 3rd phase)
B
B+ (Faction/Race Leaders)
A-
A (Semi-Gods)
A+ (God)
S- (True God)
S
S+ (Orphis)
SS (Great Red)
SSS
Z