One of my biggest complaints with role playing games is the integration of race. In a world with elves, dwarves and catpeople, I feel like the race is essentially an aesthetic choice at the beginning, eventually overwhelmed by class abilities and only invoked by the DM every time they want to inflict some level of racism. Similar to Familiars, they don't exist till the DM want's to inflict 1d4+1 con damage as they die.
In a world of +6 to Con belts, temporary hit points and +whatever spells, a +2 to health is a bit of a joke.
One of the main goals in the system I'm developing is to have races granting the possibility of new abilities and bonus that can be unlocked as the character progresses. Almost as if it were a mini-class. I guess I'll have to explain my current theory on classes to make that more clear. And that's where it's less settled.
This would make implementing new character races a lot of trouble. However, I have some tricks in mind to keep enemies less complex. More to come... I think I've got about 2-3 more posts just from this one.