Well, my tag is Jaenara Belaerys so I suppose:
House: Belaerys, why not? They're dragonlords.
Sigil: Golden dragon breathing red flames, on a field of green. Most certainly not canon
Words: We Stand Above All. Technically true, House Belaerys has dragons.
Colors: Green and gold, a little bit of red.
Keep: Dragonstone, drove out the Andals who dared set foot in a keep made for the blood of the dragon.
Ancestral weapon: Seablaze, a Valyrian greatsword. With the secret of producing dragonstone (the material) and Valyrian steel, Valyrian armor and swords are numerous amongst the house members.
Kingdom: Western Essos, ruling the Empire of New Valyria.
Liege lord: The dragon does not bow. Not even to another dragon.
Blood line: Valyrian nobility, one of the greatest of the Forty Families.
Traditional appearance and house traits: Valyrian silver gold hair, lilac, indigo and violet eyes, duh. Produces many great warriors and statemen. Helped destroy those pesky Rhoynar who dared lay hands upon the blood of the dragon.
Founder: Lost to time, lived at the founding of the Freehold.
Origin story: Founded in the Freehold, over the 5000 years the House of Belaerys rose through the ranks, to almost always having a triarch on the ruling council.
Current state of house: Ruling, very populous, very rich actively breeding dragons and riders. Denying Volantene and Lyseni overtures for the rulers to grant dragons. Denying request on the grounds that if they had dragons, they would no longer need the House of Belaerys.