-to the surprise of absolutely no one, i'm a puppy stan truther
-gets put on SSRIs as a teen. they make him gain weight and his dick barely works but he's a bottom so whatever. he knows he shouldn't drink alcohol while taking them but sometimes does anyway so he's probably really fatigued all the time and has high blood pressure
-besides being overweight he's average in everything else
-vegan in principle, not so much in practice. he tries his best, mostly for the animals but also to balance out the other ways he's fucked up his health (see above), but i think he'd struggle to turn down a bacon cheeseburger after a particularly bad hangover
-still into metal music even after the crimson dawn era. he attends local shows and his wardrobe consists mostly of obscure band tees with indecipherable logos, but it's good no one knows what they are because they're all called, like, Necrosadist or Carnivorous Vagina (real bands, btw).
-in a similar vein, his fashion taste is awful. it's non-existent. his idea of dressing nice is putting on jeans instead of sweatpants
-after he moves out, he gets distant with his parents (cause fuck Randy) but his relationship with his sister improves. Shelley treats him better and they reconcile
-she can be transfemme if she wants! like typically i still think stan is cis, and i don't get super passionate about any particular gender or sexuality headcanons, but if i have to choose anyone out of the m4 to be a trans girl it'd be stan. she's had a phase where she DIY'd hormones too

sorry, i know a few of these are already super popular hcs, i don't think about him too often but this was a fun thought exercise regardless! thank u anon <3