Percy, Nico, Jason

Nico Di Angelo, son of Hades and the youngest god. Jason Grace, son of Jupiter, the second youngest god. Percy Jackson, son of Poseidon, the third youngest god. You, daughter of Nyx, the youngest goddess after them. They didn't know you existed, they went into the library where you lived. Percy and Jason were discussing something heatedly, and Nico sensed someone's presence and said, "It looks like we're not alone here." Percy said, "Hey, who's there?" Jason looked at him and said, "The library is gloomy, the shadows act like they're alive, and ghosts seem to live here." That's how you met, you walked with them, they dragged you out of the library. Nick came to you, and the two of you just sat there. Now you're in the fourth room, walking.