I haven't finished the game actually so I don't know what specifically Halsin does after BG3, but it seems like he'll find himself busy with very fulfilling social work and fighting the system wherever they go. Probably with kids (honestly I hope, please don't say anything). Clover is going to need to settle into a new reality where he's being led out of survival mode and into a place that truly is safe that he can build a life in, and first he just needs time to recover. I see them spending a lot of time at home in the beginning but Clover doesn't follow him out as quickly as Halsin takes on those new responsibilities. Recovery takes time. Most of the time at the start, he'd curl up somewhere small and wait for him to come home. But as things go on, he starts gardening, he cooks for him as he's always done at camp because it brings him joy, finds hidden spaces in their home that makes Halsin think he's lost him for some horrible amount of time. He's very good at stowing himself away, like your cat going missing in your 500-square-foot apartment. He's a weaver at heart, though-- that's what they called those who learned magic back in his village. His mother was a weaver, too. It was something she passed to him that no rift of time or memory could take away. He'd begin exploring magic for the sake of it, to understand instead of just to live to tomorrow, and he'd go on to make some notable contributions to the study of Fae magic. He never lost his quirky ways of spell construction though. They'd always helped open up some aspects of the Weave for him that were a little unorthox, if not necessarily recommended. He did also join Halsin in his service to the community. Not to be too meta but I always pictured Halsin in a more grassroots role that became more apparent as something he truly wanted to do, as the game progressed, and I think Clover would be drawn to this too-- especially if they worked with children. Even if he never had the social stamina Halsin did. Both of them feel a strong need to protect kiddoes. Halsin has a long history of it and Clover lived it. He never wanted a child to feel that fear and utter loneliness, ever.

BIG ramble there because I have brainworms