There are 4 potential results from the inter-populating of different races.
Firstly, no children. Most races are incapable of creating offspring with others of different races.
Secondly, offspring are simply the same race as their mother or father.
Thirdly, offspring are a new, distinct creature, but are incapable of producing offspring of their own.
Finally, offspring may become their own race which can breed and propogate their own kind.
2 special cases are Orcs and the Frost Elves.
2. All arcane elves interbreeding result in young of their mothers race.
All beast kin can reproduce with those in their domain (carnivore, herbivore, avian). Offspring will be the same species as the father.
Man races have a 60% 40% split for Mother or father.
3. Humans/wood elves and beastkin produce mutans and animen respectively.
arcane elves with draekin produce the great-born
Wood + arcane produce Albus
4. Drakinborn (man + Draekin)
Ettinmen (man + giant)
Half-elf (Man + Arcane)
Halfling (Man + wood)
Goliath (cyclops +orc)
Hobgoblin (orc + goblin)
Great orc (Orc + mo'gar)
special
Orc
Black, White, Red ( + Arc (D, H, A))
Bull ( + Bull)
Draci ( + Draekin)
Feral ( + Carnivore beast)
Half-orc ( + Human)
Wood ( + wood elf)
the possibility of becoming any of the races in their genealogy.
Frost elf
The result of Dark elves, Half elves, Ettinmen, and Men living together and interbreeding constantly for 400 years. (or so) because they embraced eachother and the races mixed free of prejudice. is no one was racist, this is probably what would happen worldwide.