A/N gods are referred to by their Roman names. 

The Chases and their allies:
Senator Frederick Chase, pater familias
Helen Chase, his deceased wife.
Mathew and Bobby, their deceased sons
Annabeth, Frederick Chase's only surviving child, now his heir.
Luke Castellan, a young patrician who is a neighbor to the Chase family.
Minerva, a Gaulish slave who was Annabeth's mother.
Tristan McLean, an equite aligned with the Chase family.
Jane, his wife
Piper, his daughter by his first marriage.

The Jackson and their allies:
Senator Neptune Jackson, pater familias
Sally Jackson, his wife
Perseus (Percy) Jackson, their son
Estelle Jackson, their daughter
Grover, Percy's slave.
Frank, a guard for the Jackson family.
Rachel, a childhood friend of Percy's- now a vestal virgin.
Atlas Titan, an equite who is aligned with the Jacksons
Calypso, his daughter.

The Graces and their allies:
Jupiter Grace, a powerful general and senator.
Juno, his wife.
Thalia, their daughter- a vestal virgin
Jason, their son
Octavian, Consul Zeus's nephew
Reyna, a bodyguard to the Graces

Unaffiliated:
Pluto Di Angelo, head of a neighborhood collegia (an organized crime syndicate).
Bianca, his daughter by his first wife.
Nico, his son by his first wife.
Hazel, his daughter by his second wife.
Will, a young physician from Greece.
Leo, a young man who runs a repair shop.