If you make a character that supposedly announces themself as a candidate for the throne at the Landsmeet, then, yeah, it's completely made-up because the game does not allow that option.
That does not prevent you from playing a character who sees their parents' death and brother's disappearance as an opportunity to seize power. The Terynship of Highever is not addressed in the game, and there is another route to the throne via marriage, should the character choose that.
Character personalities lead naturally toward action - this choice rather than that choice. And choices require resources to be implemented. I don't quite get the hostility in your response.
My point is simple: the value in a very open beginning from an RP perspective is radically undercut by a game that doesn't give you the option to follow through on what character concepts you might develop. The game prevents you from playing a character who sees the loss of their family as an opportunity to seize power because there's nothing in the game centered on that content, really, apart from the possibility of marrying into power. And that really only works for Alistair, because Anora directly tells you that you're not going to have real power in the relationship and be the subordinate partner.
Fergus is always going to be Teyrn, and there's nothing you can ever do about it. If you're a man, all you can do is take Loghain's fiefdom (which everyone can get) or play trophy husband to Anora.
So my point - made very generally and not really an attack on anything you've said, despite your feelings - is that an open-ended beginning isn't always good for RP. Because when the game doesn't tell you what's actually possible in game, it can lead to creating characters whose views and opinions and plots you can never express in game.
I could invent a conversation in my mind where DudeHN tries to grab the Crown or the Teyrnship and gets rejected. But that's fantasy. The game doesn't allow it.
Drinking the kool-aid gives you some key attributes of a GW - the ability to sense (and be sensed by) darkspawn, and to slay the archdemon. The taint. Aside from Riordan, I don't see any other GWs showing up to help out, or claim any jurisdiction over you. What it means to identify as something probably varies a great deal with the individual.
My point is just that being a GW is different from other people claiming you are one. That's another issue with the RP freedom point - DA:O makes a choice about your self-perception that it never bothers to explain or express to you, but is an important part of how you can act in the world and what options you are given in the story.
This goes back to my original point: it's important in an RPG for the game to explain to you what options you're allowed to have, and how tight the yoke is that restricts your freedom. Because that's the only way you can actually RP in a way that isn't essentially inventing content for yourself that is not featured in the game.
In any case, other than setting up strawmen to try to pick apart a quick example I threw out as a way of illustrating how it can feel different to role-play characters with different values and mindsets - or complain about a particular character type you weren't able to play in DAO, what is your real (off-topic) point and purpose here?
As I said above - my point is that it is simple. Just getting to be a Turian looking PC instead of a human looking PC doesn't work if you don't get the option to truly act like a Turian. It wasn't an attack on what you said - I just meant to use it as a platform. I apologize if you took offence.