So I'm thinking about how Larian could implement future origins like TDU in future games, be they Baldur's Gate or not. Up front I'll admit that I would far prefer TDU style origins over the kind we currently have, hence wanting to discuss ways of using them.
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There's a lot of possibilities that I hope they pursue with this new style of origin.
I am guessing that The Dark Urge was introduced as a result of player feedback that people wanted to create their own character but still have a beefy story to compete with the companion ones. Personally, I like the "blank slate" Tav and think there's a lot of potential there for creating smaller points of connection to the world without compromising on flexibility, but I think it's great that Larian seemed to have listened and are now trying to cover all the bases from total flexibility to a predefined character, and now with something in between.
And I agree that it feels like the approach for The Dark Urge could be extended to other origins, to give additional stories players can be part of while still being able to pick their class and race.
As I'm such a fan of the potential of the totally flexible route, personally I'd rather Larian looked at more modular ways to give players options to connect their players to the world (so, eg, as a monk, cleric or even paladin you could choose to be a Sharran and involved in SH's mission as you say, or as a druid you can choose to be from Silvanus' Grove, or a Shadow Druid initiate from Cloakwood, as a ranger you could choose to be hunting down representatives of a strange new cult, etc, but that doesn't necessarily define your whole story and you could also pick, say where you're from, whether you have family, and so on from a menu of options (including "none" if none suited), that then would be reflected in small ways in the world, rather than a few epic tales.
But then I can see epic tales working too, and can understand if that's more to other folks' taste. Feels like definite DLC potential!