Name: Pigfarts Correspondence School
Members: students from the other wizarding schools in the world except from Durmstrang (https://harrypotter.fandom.com/wiki/Wizarding_school#Known_wizarding_schools) and Pigfarts, on Mars who have come to study at Hogwarts for their sixth year.
Founder: Lord Bacon Fartus founded the school in 1526 in order to share his Martian magic with puny Earthlings.
Traits: confused; rightfully irritated by all other houses; just normal people really.
House values: trying not to die; wondering why Gryffindors and Slytherins aren't more focused on trying not to die; just focusing on education without making a fucking big deal of it like Ravenclaw does.
House proficiencies: all subjects except Divination (which somehow no-one at Hogwarts seems to have noticed that the professor has no ability at) but they're only a normal amount of good at them.
Animal: pig (duh).
Colours: pink and brown.
Architecture and structure
Common room: on the fifth floor of Hogwarts, the only one that has staircases and doors that don't move about. There's a kettle, a coffee machine, some desks to work at and a noticeboard per wizarding school where messages you place on the board appear at the corresponding noticeboard at the other school.
Founded in 1526, Lord Bacon Fartus wanted to create an exchange program between Hogwarts and Pigfarts. The then-headmistress Sowena Scufflepuff thought this was a good idea because she was confused why so many of the students in Hogwarts were dying of their own accord (nothing to do with the most recent subject of the time, Dragon Milking) and thought she could learn from Fartus, with his spotless record of no fatal accidents on Mars for three months or so.
Martian magic mostly consists of the same types of charms and curses as in Earth magic, but you have to do a tap dance before casting each spell. The House was initially populated with students even weirder than Hogwarts, but as time progressed and students began to come from other schools on Earth, the House began to gain a reputation for being normal and boring.
The house was disbanded in 1874 when the exchange program fell through. The headmistress of the time, Bodric Blytherin, gave the statement: "It was no fun because none of them died. What's even the point? I'm not running a daycare here – this is a trial by fire of what the wizarding world is like."
Significant students include Elizabeth Lee (1794), a normal student whose only significant action of note was accidentally saving a student from dying during their second-year exam on Hula Hooping But The Hula Hoop Is On Fire by tripping over while carrying a barrel of wine to the staffroom.