Child of Zeus: Slytherin - They are usually really ambitious and pretty intimidating, plus they are definitely resourceful. The only thing that made me hesitate was that they are usually quite frank and honest, which might make them lean towards Gryffindor, but I thought the other qualities overrode it.
Child of Hades: Slytherin - Cunning, ambitious, sly, fierce, unafraid to work for what they want.
Child of Poseidon: Gryffindor - Children of Poseidon are usually all about courage, being noble, and are often quite loud and reckless. They also have a certain level of chivalry.
Child of Demeter: Hufflepuff - I hate to go with the stereotype on this one, but it does fit pretty well. Most of them are hardworking, patient, and kind. Pretty Puff-ish.
Child of Ares: Gryffindor - Okay, I had a hard time deciding between Gryffindor and Slytherin, but I realize that children of Ares are undeniably brave, always. Also, they are really blunt, and that definitely tips towards Gryffindor.
Child of Athena: Ravenclaw - Children of Athena are notoriously intelligent (though sometimes in odd ways), creative, and logical. Many are brave enough to be fit for Gryffindor, but honestly, I think the Ravenclaw qualities easily trump it.
Child of Apollo: Hufflepuff - thoughtful, kind, hardworking, compassionate, and optimistic. Shoo-in for Hufflepuff.
Child of Artemis: Gryffindor - honestly, because the Hunters are such a diverse group, you can't really label them one way or the other. But I feel like courage is such a high quality that Gryffindor is the best option here.
Child of Hephaestus: Ravenclaw - like the Athena children, Hephaestus children are creative, clever, thoughtful, and have a strong desire to build things. I think that puts them firmly in Ravenclaw.
Child of Aphrodite: Slytherin - I struggled for so long between Gryffindor and Slytherin, because children of Aphrodite have this reckless, fun air about them, like Gryffindors do. But they also have an undeniably Slytherin way of trying to get what they want - and they're quite resourceful.
Child of Hermes: Gryffindor - they are mischievous and very daring and reckless. They don't stop to think very often, and they are pretty brave. But because of their deceitfulness, Slytherin is also high on the list.
Child of Dionysus: Hufflepuff - my reason for this is that children of Dionysus are so dang dedicated. They are also really hard-working and usually pretty friendly, although rarely patient.
YOU ARE READING
Demigods As... (Vol. I)
FanfictionA book (based off Percy Jackson) about the twelve Olympians' children and how they would react in different situations, what they are in different scenarios, and the like.