What is so interesting about Halsin? He is a very generic character with stereotypical lines.
I actually found him fairly likable from the get go, but boy if this community didn't put its best effort in trying to make it become an insufferable meme.
Also, not every half decent character needs to "become a companion right now".
See similar requests for Minthara or the failed Bard of Cringe Alfira.
And yes, "the more companions the better", but ideally not by recycling B-tier NPCs.