I'd totally want to be a Slytherin. I'm creating one of those Gryffindor-Slytherin situations in my YA UF so that the protagonist can subvert the traditional values and join the Slytherins.
I did the same thing in my D&D game.
Except MY houses are split - not along moral of ethical lines - but rather on the division of the multiverse.
See, in D&D, the universe looks like this.
And it is divided into...
The ELEMENTAL planes, which are 6 planes (Fire, Earth, Air, Water, Negative Energy and Positive Energy) that are the fundamental building blocks for physical matter. They also have meeting demiplanes, obviously. Like, Fire/Earth is Magma, and Earth/Positive Energy is Mineral and so on. The demiplate of Salt is the least popular.
Then there are the MATERIAL PLANES, which are worlds like this very Earth. They're where mortals live. Their dreams create the
ASTRAL PLANE and ETHERAL PLANE, which are both huge swaths of chaos matter, forged into solid objects by willpower and traversed by astral projection and dreamships and so on.
Then there are the PRIME OUTER PLANES, which are where faith and philosophy codify reality. Mortals dream of Gods and Demons and Angels and Devils on the Material plane, and it creates the picture of the Outer Planes. Creatures here usually are physical embodiments of philosophical ideas.
And at last, there is Sigil, the City of Doors, which sits at the center of an infinitely tall spire at the center of the multiverse. Ruled by the Lady of Pain, Sigil is known as the Cage because you cannot be unwillingly taken from it through magic. It is called the City of Doors because every doorway, arch, window, or other enclosed space is ALSO a magical portal, which can be activated through certain "keys", which can be literally anything.
SO
My houses are
PRIMUS, MATERIUM, ELEMENTUM, and SIGILIUM.
Those of intense conviction and philosophical bent go to Primus.
Those with a deep connection to the material world and the constraints of it go to the Materium
Those with creative sparks and elemental natures go to Elementum
And those who are travelers, cut throats, cheats and rogues...they got to Sigilum. The weirdo house.