The game gives seriously so many whumpable ideas for Halsin.
He has been kidnapped two, possibly three times by the end of the game. One of which involved him becoming a sex slave and one of which involved him being tortured by goblins.
He can't always control his bear form. Has transforming at the wrong time ever hurt him?
He doesn't fit in at his Grove, and especially he hates being leader of his Grove. He must be awful lonely.
He saw almost all his friends and his mentor die in battle. Imagine him wearily leading the survivors to safety.
He has abandonment issues! Literally any time you break up with him, split the group up in the end, etc he says he knows nothing lasts forever. He is SHOCKED you want to go with him to his commune, and if solomanced he is fully convinced the party will remind you how much you loved adventuring, causing you to leave him.
He used to have a drinking problem! Imagine all the angst there!
That scar on his face. He must have gotten FUUUUCKED UPPPP to be so badly scarred that magic couldn't fix it.
His entire family is dead, and died when he was young at that!
His reputation from when he was a sex slave is such that the Drow twins had already heard of him.
The player has the ability to threaten to sell him back to his captors- imagine a whumper doing that to him.
The Grove raid! Imagine his agony at realizing all the Druids he cared for are dead.
Similarly, the Rite of Thorns- his knowledge that his Druids wanted him gone.
If he's kidnapped by Orin, his reaction to being rescued- or to Speak With Dead being used on his corpse- makes it clear he never expected to be saved. How does he get to THAT point?
He mentions people have tried to start fights with him before because he's big and they want to prove their strength like how sad must that have been for him????
The Orin abduction scenes hint that he is actually terrified of losing control of himself and harming innocents. Imagine what must have happened to make him afraid of that- either having done it before, OR thinking so lowly of himself that he thinks it actually could happen despite the lack of evidence.
And that's not even getting into all the cut early game build whump...