Does he fit FR lore? That's a good question. You've quoted parts of a fan wiki page, but I don't feel you really put that description into perspective before deciding that he's a good fit. I consulted the same page and I can't say that I see any fit at all. Vampire spawn are aggressive, not whiny little "please let me be your poodle" type things. They are arrogant and certain of their own superiority, not puffy snobs.
Sure, if you kick Astarion enough, he'll start blabbering about how he is strong and whatnot, but he'll hardly come off as a strong being, will he? It feels a lot more like some goblin trying to convince himself that he's a bugbear than an actually strong creature explaining to a weakling why the weakling should want to hang out with the strong creature. And isn't that what Astarion should see all others as? Weakling lunchboxes? He even has this line about how the protagonist needs him to be strong. The protagonist needs him? A vampire spawn is arguing that someone else needs him as their minion? How does that work?
The point of this thread? I'm guessing Teclis wanted to rant about Astarion being a bit flamboyant in his behavior, but currently I guess we're all just letting off some steam regarding how he rubs people the wrong way because of what a pathetic character he ultimately is.
Perfect post.
The point of the thread is to point out how bad the writing is at the moment, which is unfortunate given they did the voice over for 1/3 of the game. Maybe they can correct in the remaining 2/3?