Inconsistent Larian strikes once again, yet I am consistent in avoiding nitpicking and forgiving them, because Baldurs Gate 3 is one of my favorite games and is astonishingly beautiful and has a spectacular story.
This, so much. BG3 quickly has become one of my favourite games despite the story faults. The only game above that for me is Vampire Bloodlines.
I headcanon, that Us gets adopted by one of the companions - I can see Gale, Shadowheart, Halsin, Jaheira taking care of it. Wyll and Karlach probably don't want to take it to the hells and Astarion I just cannot see caring for Us. Lae'zel might have conflicetd opinions about our 'not quite cat', but she probably is wise enough to not take it with her to the other githyanki.
And I would honestly be afraid to leave Us with Minthara, especially, when we kill the Netherbrain and she looses her powers. She is probably not in the best mood then?