I was the only one at book club who liked Gideon the Ninth. So it goes.
GtN amusingly sets up and then mostly ignores the standard YA team configuration. There are eight houses, each with their own theming. They have standard colors, modes of dress, cultural emphases, and personality types. Each house specializes in a form of necromancy, and it is implied that the cavaliers' off-hand weapons vary similarly.
This lines up with Hogwarts houses, Divergent factions, etc. People love to sort themselves by color, Myers-Briggs type, zodiac sign, humor, etc. Presumably someone has already made a crosswalk that aligns two The Locked Tomb houses with each medieval humor or takes each of the 16 Myers-Briggs types and assigns them to the 8 necromancers and cavaliers, extrapolating each of those to the entire culture despite the problems of doing that with the ones who appear at Canaan House.
And then, Gideon being Gideon, this is a mostly ignored bit of world-building rather than a central theme of the story, despite the structure of the lyctor trials and the explicit inter-House competition going on. Most other books would use this as the scaffolding for the entire story, and in fact some of the characters are inclined in that direction. Gideon of course tries to learn as little as possible about how the different forms of necromancy work, nor does she want to learn about a House of poets, historians, etc. She pays more attention to cavaliers' off-hand weapons.
Some TV or movie executive must be salivating at the idea of having a The Locked Tomb series and already has designs drawn up for merchandise for each House. Online quiz to identify your House and social media icons! Buy the T-shirt, hat, wall poster, etc. for your House! A theme park land outline to sell to Disney, Universal, or Cedar Fair! Get the whole set of TLT Funko Pops!