Reyna Avila Ramirez-Arellano

The praetor of the roman camp, respected figure amongst an entire city.

The daughter of the Roman war goddess Bellona, she quickly learned to fight after being released from the island of the sorceress circe in 'the sea of monsters' after Percy and Annabeth let a bunch of pirates loose

Although never said outright, it is heavily implied that she has had a crush and both Percy Jackson and Jason Grace.