The Green Hermit
Hero
All races are allowed, but I usually limit player choice, especially at the beginning of the campaign and if they are inexperienced players.
That's one reason why I wouldn't let anybody choose Dragonborn in my current campaign. They are the enemy.That's kind of the big reveal you can pull.
No you can't be an elf, no I'm not explaining why.
Then later in game they find Elven ruins, tombs, writing, artifacts etc. Perhaps angry undead.
That's what we agreed to when I ran Curse of Strahd. To fit a more gothic theme, we opted for Human and no more than one of elf, dwarf, or half-elf. It felt more immersive for us, especially given Barovia was almost exclusively human (with a smattering of dying elves), than throwing in a dragonborn or tiefling or even jolly gnomes. Those would fit better in another story.I feel like you can easily explain why by just saying "story purposes".