Muzan Kibutsuji - the leader (you know already) who make sure every one of his roommates are alright, he even never forgets about bills and if anyone dares to pretend like they already split money for the bills/rents their ass will be kicked, he's like a big daddy to everyone just trying to get everybody to get along with one another even force each other to spend days together like on road trips, dining out, going on shopping spree ect,
Kokushibou - when Muzan goes away Kokushibou always makes sure nobody destroys the house, even fighting with one another, he's hella strict so if any one leaves their dishes or one miserable spoon in the sink he forces the one responsible of the dishes to wash them and he ain't letting him/her go until it's done.
Douma - is the loud mouthed guy, always whining how he's always bored and asks that dumb ass question "is anybody bored??? what should we do today????" then gets excited over basic normal stuff like going to the movies or some shit, his room is super messy (due to eating lots of women, just human remains all over his room), it pisses Akaza off whenever he bust through the room needing a charger and sees all the mess. Douma would also to playfully tease everyone with dirty jokes nobody would even want to hear.
Akaza - the only one with some common sense, he tries his best to make his roommate buddies having a well being, does basic chores and all that crap, he is even the one who cooks, get the mail, blah blah, sometimes he sneaks out to warn all women to get away from Douma, if he forgets to do that all hell would break loose. when Akaza i in a bad mood he goes watching Netflix or Disney plus. when Akaza's bored he would binge watch ASMR stuff to prevent himself from strangling Douma. Akaza would also keep all his social medias as a secret and if he gets into drama with Douma he'd post on r/AmItheAsshole or r/Entitledpeolple (all his posts are about Douma).
Hantengu - is the weird introvert of the house, and a massive cry baby, he'd do anything to stay out of social gatherings and locks himself in his room (it never works since Muzan would kick the door down and drag him out of his own rabbit hole), when Muzan makes everyone watch movies together or have a normal game night Hantengu would hide in the stair cases watching from afar, if an argument breaks down he'd cry which one of his personalities (probably Sekido or Zohakuten) come out to slap the shit out of whoever is making Hantengu feel scared as Muzan would face palm while one of the roommates get slapped to next Monday.
Gyokko - would talk about art non-stop to everyone in the dining table as everyone (except Douma) would groan, this is the 95th time he talked about art for today, when Muzan takes out Upper Moon for a shopping spree Gyokko would fill his cart with all art supplies and stuff, he even does Art Commissions online surprisingly but gets pissed when some people asks for art for free then insult him when they hear the price. when he enters an art competition he gets extremely competitive like that one time a kid painted Gyokko would straight up laugh at his face and paint a better version while the kid cries his head off.
Daki - buys all expensive stuff like Gucci and stuff, make up, loads of make up and does Make-Up tutorial videos, tea spilling videos, dancing videos, ASMR even Mukbang along with Douma, she doesn't want anyone to know but she'd lock herself in her room to play any game of Just Dance, also she is extremely popular in every social media she has including Tik Tok, like everyone loves her but if somebody has more attention Daki will be destined to be more popular than that person. Daki even takes loads of Selfies of whatever she's doing including with her brother which pisses off Gyutaro.
Gyutaro - would play with loads of video games, he even joins Roblox -cough- and almost wastes his money on Roblox just to laugh at a kid who once called him noob, Gyutaro's gallery is full of dank memes/cursed images as his phone background wallpaper is that meme Stonks, keeps a snake as a pet and he named his snake Mr. Noodle, also he'd be the type to download every kind of weird music that has to do with Ear Rape and blast them out loud in his headphones, one time his ears bleed out while listening to Caramelldansen ear rape version in the dining table, the only one who noticed was Hantengu because he cried his lungs out and pointed at Gyutaro which his ears bleeding out like Niagara falls while listening to the loud music. Gyutaro even raids all school online classes on video chats/Zoom all because he subscribed to Twomad and wanted to be like him.
Kaigaku - is the emo kid and listens to a bunch of rock/heavy metal songs, he even screams out the lyrics holding up signs and shake his head around like he's possessed or some shit, when he does that in the grocery market everyone thought he's "Special", attends lots of concerts listening to his favorite band and does the head banging while dancing aggressively, his room is full of posters of his favorite rock band.
Nakime - stays out of everyone's way and just wants to be left alone, is that goth gal with great taste in goth fashion probably, in her free time she plays her favorite songs with her Biwa. (I'm sorry I can't think of anything else of a headcannon about Nakime, forgive me)
