I mean, from a lore-stance some of them would make sense, right? They are half-human, after all.
A abandoned dhamphir might be discovered and raised by, I dunno, Ratfolk, hints Adoptive Parentage
Or they grew up in the streets/wilds/slums, hints Heart Of The traits.
Say they found friends among Halflings who accepted their genes, got the Tribalistic trait, or the Social Ties trait?
Kinslayers would totally deserve the Shadowhunter or Practiced Hunter, too. Or a Dhamphir with Child of the Necropolis or Corpse Dodger traits as well, having to evade undeads growing up.
Ah, just some thoughts I was humouring.