you're right that it's not exactly the same with rp but i think the lines are a little blurrier than that, nonny. parasocial behavior isn't necessarily contingent on 0 social interaction - for example, someone who gets overly attached to a small time streamer who chats/responds with their viewers on stream. or starts behaving inappropriately with a voice actor who they've chatted with and been a fan of for a long time. one of my friends is a "BNF" (emphasis on the quotation marks) artist in a specific fandom for a specific ship. while 99.9% of the time they have nice fans, they also get weirdos who start sliding into their dms behaving in an overly familiar way because they chatted about the ship a couple of times.

what feels 'parasocial' about this kind of thing imo is when the social bonding happens over a shallow connection and happens over usually a relatively short amount of time. if someone considers me a friend after 6 months of rping and regularly chatting so that we have a sense of each other's personalities outside of a shared fandom, that's one thing, but... if all we have in common is a fondness for Kingdom Hearts and a ten comment threads, who did you (general you) make friends with really, other than an idealized image of the person on the other side? i have had the latter happen before and it was honestly really disconcerting