How to the ratings work?

[Zeba]

I know chad is the highest, but being new I can’t wrap my head around all the other rankings. Just a list from top to bottom and description so it is clear:
Chad: best looking
….

 

[Fiqh]

Chad
Chadlite
HTN
MTN
LTN
Subhuman

 

[Zeba]

Chad
Chadlite
HTN
MTN
LTN
Subhuman

LTN average?
MTN good looking high average?
The rest self explanatory