I think with an original scenario, we could easily throw in multiple races. I think races could have subraces to make things better.
For example... Something along the lines of...
Human Race
Prehistoric Subrace = +2 STR, -2 INT along with resistance to fire
Zeal Citizen = +2 WIS, -1 CHA, -1 DEX along with some spells
Earthbound Citizen = +1 DEX, +1 CON, -2 WIS along with resistance to cold
Middle Ages = +1 CON, +1 STR, -1 DEX, -1 CHA along with weapon proficiencies
Future Traveler = +2 INT, -1 WIS, -1 CON along with and extra tool proficiency
Then you'd do the same for various other races.
Mystics have Hench, Imps, and Diablo.
The future can have a robot race with several robot subraces.
The Reptite, the Dragonians... Then we can throw in the Chrono Cross races -- dwarves, fairies, mermaids, otherkin (Turnip, etc).