bucky does not embarrass easily. being raised a soldier in both america and russia where he had very limited rights and privacy means he's very much used to humiliation and other sort of shame rituals involved in being in a gulag and a military camp. things that others may normally feel shame or embarrassed to perform or be around, such as nudity, masturbation, having to use the bathroom, etcetera, almost none of it bothers bucky. it doesn't mean he actually wants to see it, bue he's unlikely to feel any kind of... "traumatized" by it or even really scandalized. people are people. people have sex and have bodily functions. its whatever. this translates into his relationships as well; he is not going to be embarrassed by being naked or near naked by his partner in any way, and is not going to be embarrassed to ask them to fuck him. shame only comes if its part of the play intentionally.
has some advanced field medicine knowledge through hands on experience. he's not a doctor or a medic by any real means, most of this was left to the red room medbay / russian military medics on standby that lived in the facility, but both bucky and tws picked up enough over the years to be able to keep most operations going without having to check in for advanced medical care. bucky can reset a bone, fix dislocations, cauterize wounds effectively, sew and stitch wounds together, debride and disinfect, apply and change bandages, utilize a tourniquet, do cpr and basic resuscitations, manually pump a heart, CASEVAC, and blast/burn treatment. some of this he learned post maiming simply so if he was ever around someone who suffered similarly, they wouldn't bleed out and die. he's by no means a doctor, but he can keep another soldier alive usually.
(similarly this also means he knows exactly where to apply pressure and cut to cause some serious pain and injuries. the winter soldier has tortured dissidents, and was very good, for example, at waterboarding.)
bucky has two laughs, and thats either a subtle, subdued, slightly moody 'heh' (again, think of jason marsden's craig boone and the very rare times boone almost laughs), or something that is a bit obnoxious and loud. not quite a dolphin laugh, but haw-haw-hawish enough to embarrass him if he's hearing his own voice.
made alterations to his invaders era suit himself when they were between breaks/leave, because the damn thing would become too small between periods of growth. bucky hated that.
even though i cannot see him wearing his domino mask in the modern day (unless it provided him a lot of tactical advantage and eye shielding, then yeah i think he would, but i digress), he still has his old one among his old things, and is still glad he wore the suit looking back. yeah, he looked silly. but he also looked like a hero, and he was harder to identify like that; they made some effort to try to anonymize him for a long time that he appreciated more than he could say. the suit, ahd the mask, meant something to a lot of people.