As far as races in this story go, there are three types - Heaven Races, Hell Races and Earth Races.
Here will be the rankings of every Hell Race that has been revealed so far in the decreasing order of power.
Higher-class Demons - equivalent of Archangels (or Higher-Angels) in power and authority
-Aknin Vielos
-Rain Green (?)
Lower-class Demons - equivalent of Angels (or Lower-Angels) in power and authority
1. Lin Demons - fourth tier of Demons - summoning done with Pentagonal Magical Symbol
2. Yish Demons & Le Demons - third tier of Demons - summoning done with Square Magical Symbol (the two types differ based on the type of power possessed)
3. Yun Demons - second tier of Demons - summoning done with Triangular Magical Symbol
4. Ye Demons - first tier of Demons - summoning done with Circular Magical Symbol
-Priscina (As of the flashback in Arc 2 "Past And Present")
*More information will be added when it is revealed in the story.