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 about your existence until they entered the library where you resided. Percy and Jason were heatedly discussing something, while Nico sensed someone's presence. He said: "It looks like we're not alone here." Percy asked: "Hey, who's there?" Jason looked at him and said: "The library is gloomy, the shadows behave as if they're alive, and it seems ghosts dwell here." That's how you met. You spent time with them, and they eventually pulled you out of the library. Nico would come to visit you, and the two of you would just sit together. Now, the four of you are walking together.