At the moment all the rooms are practically in rubble, so Marc won't know Artemis is his roommate until like, next week. INTERESTING that her name is a Greek Goddess, though! He's only told one other person so far about his personality disorder, and nobody knows about him being an avatar of Khonshu yet... he's been kinda avoiding people because he's concerned about being judged and shit.
THOR WILL PROBABLY LOVE HER!
She needs to meet Pikachu, STAT!
And Stephen will be interested in getting to know her and comparing magic.