(forgive me if any of these seem like inaccurate or whatever </3)
john 100% has autism
dave is audhd and ptsd in my eyes, i think he definitely leans more into the adhd part but ive alwways hced him as having some sensory issues
rose definitely is at least a little bit autistic , not too sure for her.
jade definitely has adhd and autism but i could see her having bpd or bipolar (probably more bpdd tbh)
jane gets intrusive thoughts, she definitely has ocd but doesnt realise it.
jake almost definitely is autistic
dirk has bpd, autism, ocd and probably dpdr as well tbh
karkat is 100% autistic as are most of the characters im realising as i type this, i think he also
aradia having dpdr is something i see quite strongly as well
vriska probably has bpd but ive seen hcs of her having npd which i can see as well. 100% ptsd too