Percy- Harry (Obviously)
Annabeth- Hermione (I know Annabeth and Ginny both date main characters, and I love Annabeth, but she is too high maintenance (like Hermione, who I also like) to be like Ginny, and she and Hermione are both really smart.)
Tyson-Hagrid
Mrs. O'Leary - Fang
Chiron - Dumbledore
Dionysus- Slughorn
Poseidon - James
Hannibal - Buckbeak
Grover- Neville (shy and weak at the beginning of the books; brave at the end)
Zeus - Fudge
Clarisse- Draco
Calypso - Cho
Piper - Lavender (clingy)
Kronos - Voldemort
Luke - Snape
Travis and Connor - Fred and George
Aphrodite - Ludo (helps main character along)
Hera - Bellatrix (REALLY annoying)
Jason - Cedric
Not Ron and Grover, because Grover never got jealous of Percy