I remember Jaheira mention Mielikki while visiting her secret cave.
Yes, but also when she curses she also mentions Malar (who, like Silvanus and Chauntea is off limits in BG3).
I have half a recollection of Wyll swearing by “the triad”, who according to my reading of the FR wiki, are Torm, Tyr and Ilmater. I think there’s a comment he makes after one of the stages in Gale’s personal quest where he compares Gale’s devotion to Mystra to his less pious viewpoint. Perhaps someone who knows more about the Faerunian pantheon has a more definite recollection.
True, but Wyll aside from swearing by the Triad also swears by Helm, and his father mentions Helm multiple times. So, again, quite hard to pinpoint! Hence this topic!
I don’t think of Minsc as tied to one god as opposed to “goodness”, but potentially Mielikki? She’s a goddess of rangers and the FR wiki tells me she has a counterpart/aspect worshipped in Rashemen.
True, in Rashemen they worship Mystra, Mielikki and Chauntea under different names. Chauntea being referred to as Bhalla iirc. But yeah, of the 3 I do not think Minsc would worship Mystra, Chauntea is offlimits so yeah, that leaves Mielikki indeed.
Astarion did say he tried them all and none answered, so I'm betting on none.
True true, but I am just speculating, if I had to throw money at the Shrine so he'd get that buff...

Honestly, I think Cyric would love to claim him (if Cyric wasn't offlimits like the others).
I guess that leaves Lathander for the lols of "full concetrated power of the sun".

There's an opportunity to pray with Karlach near the end of the game, but I can't remember which gods she mentions - she picks out a few.
Oooooooooooh! Is it after she runs off after Gortash's death?