The Seven Demigods

So we all know that the seven going on the ship have the parentage of
Poseidon
Athena
Zeus
Hades
Ares
Aphrodite
Hepheastus

and we know that
Percy
?Annabeth?
Jason
coming back to it
coming back
Piper
Leo

So we think that Hazel is Pluto and Frank is Mars
They could be but their names could be different
Hazel can be Ceres 或者 some other demigod
And Frank can be Mars cause of all the weapons but his last name means master of bows so he could be Apollo

there are definetly seven demigods going but there could also be fauns/saytr

Juno also 说 in chapter two that they would have to make some sacrifices it could be...