I don't see these people are special snowflakes.
We have a charming rogue who is suave and sophisticated, also it turns out he happens to be a vampire. Being a vampire is kind of a big deal, but he doesn't want it to define him.
We have a world weary wizard full of knowledge and weird stories, does he has unusual dietary requirements? So what.
There is a cranky cleric with a secret, and a strange name, I haven't been partying with her.
The Githyanki is a Githyanki, it defines her because she's Githyanki, what do you want here?
They have a thing, having a thing isn't bad. Being a vampire isn't actually much different than "from a place you can't go."
The people comparing it to DAO, though, is funny. What are the aspects of those characters? Leliana and Zevron are from a place. Wynn is old. Oghran is a Dwarf. Alistair is royalty, which is a major plot point more than a character aspect, otherwise he's part of the same order as you. Morigan is an Apostate. These are not terribly deep quirks.
I think what this is missing is the relatable one. Imoen was the one you grew up with. Alistair was the most recent Grey Warden before you. You share something and can talk about it without having to work on it. You share something with everyone in BG3 but the link is more of a goal than something to chat about light heartedly.
