F-:Normal human
F:Peak human
F+:Super human
E-:Low-Low class
E:Low-mid class
E+:Low-high class
D-:Mid-low class
D:Mid-mid class
D+:Mid-high class
C-:High-low class
C:High-mid class
C+:High-high class
B-:Ultimate-low
B:Ultimate-mid
B+:Ultimate-high
A-:Satan-low
A:Satan-mid
A+:Satan-high
S-:Super-low
S:Super-mid
S+:Super-high
EX:World Ender