The only one that really gets out without much of a fallout is Gale when he brings the crown to Mystra. Though I don't know for myself just yet how Mystra taking him back under her wing affects his relationship with Tav (given Mystra's grooming tendencies and Gale's deep connection to her). Lae'zel staying with Tav feels good for the romance part, but comes at the cost of her greatest wish - to become Kith'rak and ride a red dragon and wield a silver sword, now as the liberator of her people and strongest Githyanki alive. So that's a 50/50 choice, much like Shadowheart's parents and pain vs no parents and no pain but deep regrets instead. Astarion is much more evil vs good coded, but what's interesting is that his story never takes him to free himself from vampirism. If that were the case, I feel like curing him and leaving Karlach to die would've made an even greater earthquake re: what's fixable or not with a fantasy realm at hand. Wyll has a solid set of choices Imo, the only part lacking is that his story is so light in content especially in Act 2, which on one hand isn't weird given Shart and the shadow curse take the scene, but I still feel like his story could've used some more meat on those bones.
Some Durge spoilers in addition to origin ending spoilers:
Made a post here a good 30 pages ago here regarding this. Based on origin Gale ending, Mystra will leave him to be with whoever he romanced, so she'll likely leave him with Tav too. Wyll just needs more content overall, only act 3 is somewhat fine but even then the Emperor steals the show when it was meant to be Wyll's big moment. He also lacks the ability to make the choice himself; we just tell him what to do. Mizora won't stop hunting his dad so he'll presumably die eventually. Lae'zel will not stop being hunted if she stays, and as it stands only Githyanki Tav gets to go with her if she leaves. I don't see Shadowheart mentally recovering without Tav romance to fully support her if she lets her parents go. And judging by how she described Shar's pain after the Shadowfell I don't think letting them live is great either unless Shar just kinda stops caring which, judging by how she is, is possible. If Astarion got an ending better than his current then there would be massive outrage, considering he's already got the most focus out of all origin companions (especially on the romance front). I don't think the conclusions are bad, even if the epilogue portayal of it is miserable (at least he gets one though, poor Shadowheart, lol). Karlach could easily be in there where she can get fixed without going to Avernus but just has some kind of impactful negative effect. Impactful enough to make the choice to Avernus still an option, but not as silly as it is now where it really isn't an actual option because death is (almost) always worse.
The one that bothers me most is Dark Urge getting a perfect ending, really. How convenient that Bhaal killed the one aspect of you that was bothering you. The worst implication of the outcome is that you might be some sort of Withers' Chosen now, but I don't even see that as being bad considering how chill Withers is, plus he goes back to bed in the epilogue anyway.
