I'd really love to flesh out more NYC stuff with your characters ahhh. The most intriguing thing I could think of right now would be Hades & Lucifer, because young Hell!lords are intriguing things.
Iseult and Hades are both 19 and both study in Columbia. Odette and I are planning for Sita (biochem) and Hades (comp sci/econ) to be sharing a complex systems class. Iseult could be in that class too, if it fits her premed program?
Deipho and Gwyn could be related through their mothers? If Deipho's family is an incredibly wealthy one, it fits because Gwyn's mom's always def the wealthy society type.
Nanna and Horus could be related through Horus's father and Nanna's mother? I'm thinking Horus's father had more of a middle-class background, since he's an Egyptologist/archaeologist.
Surpanakha is ever available as the occasional lover.
Hermes... GOES SOMEWHERE. Use him anyway anyhow anywhere~