dunno where to start i am so sorry. here's the ones that come to mind

Markus - my lovely freakazoid brain parasite. he's actually supposed to be a really dirty blond and that's how its read in world but i cannot stop myself I HAVE to make it look like he doused his head in some very diluted mossy green dye. as for lore there's like 3 versions? aus?; uldc and cv and navve. he's all some variation of autistic and terribly self sacrificial though.
- uldc is just an rp between me and my friend. urban legend demystifying club. it was supposed to be a debunking club but they find out ghosts and spirits etc are actually real so now they're just trying to figure out sanman city's mysteries. he's the tech guy. he's trying to warm up to them because for how much he is invested in what they do he barely tries to befriend the group
- navve is the original. I will refrain from speaking about it for now.
- cv is just code vein au. which is where it all kind of started. he lost everyone he loves and right now he's trying to find the body of his bestie's sister, whom he was made to promise that he'll revive on the occasion that they both died. also he lugs a massive sword around <3 kyaahhh

Salome - the OG. i think she's where my green haired character obsession came from. she was supposed to be a the arcana oc that I repurposed to be a character all on her own. don't ask me about it. she's a physician and she really does not like most people. rather misanthropic, i'd say

Felix - ex brain parasite. Though i think his hair is closer to a mint color. whatever. He puts up quite the pretense of being super serious and tense (well, he is) but he's a lot more lighthearted than he'd seem. being very anxious about things is just how he functions. though nowadays he's a lot more confident i think he still has a penchant for pessimism and cynicism. he used to be a detective!

uhhhmmm. i have a good amount of physician ocs i think there's a lot of them who are at worst decent at medical care. but for specifics i'll just list down the ones i think i talk about the most

Salome: she is a physician. she was studying to be a surgeon but she quit halfway through for Reasons. but she knows what she's doing and she can perform surgery in a pinch but do NOT expect any sort of uh.. emotional nursing or something. actually being taken care of beyond the injury. She'll tell you what to do and when to do it but idk if she'll stay beyond what she deems necessary. she's got places to be

Markus: dependable enough. much better at trying to nurse them back to health instead of the patching though. good if you like soup and some really nice food because he has an entire garden of herbs to make use of

Felix: he fixes up scratches and normal bruises and maybe some kind of deep wounds but i don't think he can do much beyond that. he's good at taking care of people in general though so I think you'll be fine but if it's anything more serious he'll probably just take them to a hospital

Lysander: i don't think he'd even register he's bleeding out until he's lightheaded so he'll probably pass out before he could try to patch himself up. 0 self preservation whatsoever. i think he'd be able to bandage people alright though... i just don't think he'll call for help even if he probably needs it