I can awnser this Question. I’ll assume this is just for the kids. In my Fic they stay in Ramshackle but if they were to be sorted into a dorm. I would think about what aspects they best fit them.
Heartslabyul (strictness), Savanaclaw (persistence), Octavinelle (benevolence), Scarabia (mindfulness), Pomefiore (tenacity), Ignihyde (diligence), Diasomnia (nobility)
Hotaruko Octanavinelle: other than her having a water digimon. Hotaruko just gives off an aura of benevolence as a big sister, but she is keenly aware that everything comes with a price. Her family owns a okonomiyaki shop so she has some business experience that would maker fit in well at the Monstro lounge.
Granit/Luka Savanaclaw/Heartslabyul: Granit is always stating the rules of tactics and is rather obedient so he might enjoy the order in Hearslabyul. But is efforts in being a protector could showcase persistence fitting for a Savanaclaw student. (Granit is kinda hard to read so I’m kinda reaching) I also thought of Ignihyde but mostly because of his trama I don’t think he would do well with technology.
Raito Scarabia/Pomefiore: his eidetic memory and scheming personality could make him a good fit. But he also shows tenacious in trying to prove his genius to others.
Makoto Ignihyde: mostly because of his technology skills, but he is a fan of horror movies Idia could show him some horror anime.
Reina Savanaclaw: kinda obvious she is athletic and is not afraid to fight digimon directly. I think she can handle the beast in Savanaclaw.
Tomaro Pomefiore/ Diasomnia: to be honest I chose Pomefiore just because Tomaro is rather pretty and I just imagine him and Epel suffering under Vil’s teachings. I choose Diasomnia because the dorm may preach nobility but it is filled with oddballs. Tomaro has been ostracized because of his powerful e-pulse and is afraid of expressing his emotions normally because of it. It just makes me think him and Malleus are similar in that regard. Plus he already has a green lizard so he is on brand already.
I’m trying to plan my fic so if you have any questions it’s better to ask me