Fighters are non-avasci users. Generally it's divided intro F-S ranks.
--F rank refers to failures or below average fighters.
--E-rank refers to average fighters.
--D- rank refers to elite fighters. Being D-rank at the age of 14 is quite the talent.
--C rank refers to veterans .
--B-rank refers to fighters between veterans and hero-like fighters .
--(A-rank)Of course hero-like fighters refers to A-rank fighters .
--As for S-rank fighters , they're literally monster .
Until A-rank , fighters have their racial talent enhanced. Racial talent though not activated, person does have his passive instincts active according to the information he personally receives . Racial talent activation refers to activating domains in which information collection is 100% efficient . The more domain extends , less efficient it gets in information collection . This efficiency increases as fighters grade up . But this racial talent also helps in enhancing fighter's body through nerves . Nerves and instincts are inter-connected . Thus body gets stronger the more efficiently we can awaken our racial talent . S-rank literally are monsters who broke through their limits .