I do like the idea of race tiers... For instance if you stuck with a race throughout the first 50 levels and once you use the rebirth stone to go to ultimate class the race could evolve as well.
Demonic- ArchDemon
Angelic- ArchAngel
Dragon- ElderDragon
Void- Overlord
Mech- A.I.
Elf- Highelf
Orc- Orge
Human- DemiGod


Etc....