A Tune To Dance To
Ravenloft is a setting inspired by Gothic Horror and has a certain thematic reasonacnce. As such there is a restriction on what races can and can not be played.
These races need no DM approval and are avaliable to all:
Drow, Dwarf, Elf, Human, Gnome, Half-Elf, Half-Orc*, Halfling
These are races that do not quite fit with the Ravenloft aesthetic, but can be adjusted
Deva, Eladrin, Shifter, Tiefling
These races are too fantastical for Ravenloft and do not fit the setting. As such, they are unavaliable.
Dragonborn, Githzerai, Goliath, Minotaur, Shardminds
*Half-Orcs as presented do not exist in Ravenloft. Orcs are unknown in the setting, with only one known to exist at all. However, what do exist are Calibans. These are not a unique race, however, they are actually humans that were warped in the womb and are born disfigured. They are mechanically identical to Half-Orcs, but are considered human.
Vistani Heritage feats
Appearing in Dragon Magazine and avaliable in the character builder, Vistani heritage feats have the following restriction; the only races that can take Vistani Heritage feats are Humans, Calibans and Half-Elves.