hello here are my system headcanons. flag used is this one. i am part of a system. my hcs are under the cut
dirk - small system (4-5), alters front for long periods of time. has good communication but fucking hates each other so that isn't really any help. horrible amnesia but works through it. dirk didn't even figure out he was a system another alter did. passed them off as bots he made out of shame but everyone figured out pretty quickly (roxy.)
jade - large system, polyfragment with subsystems. fictive/introject heavy. frequent switching but it stabilizes on earth C when she's in a more steady, social environment. alters often talk out loud or leave notes for one another, very little internal communication most of the time. people know she's a system
jane/jaye - medium system (at max has had 12 active) and was completely unaware that's what they were experiencing until dirk told them. system is primarily internal, so like lots of shared thoughts/experiences rather than outwardly talking to people. a lot of people are unaware they're a system without them mentioning it. barely any switching.
tavros - medium system, fictive heavy. switches semi-frequently, but he got really good at masking. system mainly communicates either internally or through leaving notes/etc. only learned what he was experiencing was a system thanks to nepeta, thought he just had "overactive imaginary friends". most have his typing quirk.
nepeta - smaller system and a lot are introjects based on rp characters, or rp characters are based off alters. not HIDING the fact she's a system but for a long time ppl thought she was just roleplaying. equius knows all of her alters and was the first to start meeting them. they mainly communicate via a custom trollian mod by sollux. they have unique typing quirks.
damara - large polyfragmented system. only tend to front during extremely strong emotional distress or other strong emotions. alters never really hid themselves; the others know she's a system and the names/pronouns/etc. heavy amnesia and not a lot of communication at all.