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Cavalier: Here, races are created not for a specific implementation, but for personal enjoyment. And I hope the paladin race was just a joke.
Ghost: Where did the vampire race fail? If you're talking about the implementation, then it was already created as a "race on paper," but there's a very well-thought-out race of cooks.
Skeptics: You can make a race out of almost anything; the Jungle race convincingly proves this.
And in general, in Forgotten Realms, they already created a race of angels, called celestials. You can slightly adjust them and add them to Heroes.