Thats not really a good ending for most of the characters he mentioned.
Wall of Text spoilers below from my testing:
Laezel can stay with you (either as friend or lover), its implied your gonna continue adventuring together and shes gonna making sure there's not a dull moment in your company.
Astarion burning and just running away is the "best" we get for him, just one comic relief moment and a big "screw you" to all the people that wanted some closure with him, he's the character i hated the most, so i kinda got a chuckle out of that ending, but i understand the disappointment from his fans.
Wyll can either be the Duke or continue as Blade, if hes Blade and you finish his quests, he ends up saving Karlach by going with her to Avernus, otherwise he's just "there" and will continue to be a good guy in the sword coast.
Karlach's good ending is either being saved by Wyll or by Tav himself, altho that means Tav nopes the crap out of the ending sequence and you don't get the other scenes (gotta rescue the waifu!). It also lacks closure and its the reason a lot of people are pissed at this ending.
Shadowheart gets the closest to a good (happy ever after) ending in this game, she is ready to settle down if she solved her issues with Shar and her family. If Tav romanced her, you can choose between a life of adventure or settle down with her (she does seem to really push for a less dangerous lifestyle tho).
Halsin got the ending i expected of him, he's gonna continue his druid-ing and that's pretty much it.
Gale was already mentioned by the original post.
Jaheira and Minsc get the ending you expected, a non-commitment to anything so that they can be re-used as characters in other D&D media :P
If you think i forgot Minthara, you are correct... the problem is that the game also forgot about her existing by the end of Act 3 as well.
Keep in mind that my description of all these endings are about as much as you get in-game. All of them are super short and only a couple phrases long.
