Alina Cruz

Alina Cruz, child of Poseidon and Jocelín, is the twin sister of the late Dante Cruz and the half-sister of Percy Jackson and Tyson. She is also the granddaughter of Bellona.

Early life
She was born on October 1 to Poseidon and Jocelín Cruz, a minute after her twin brother Dante. The twins lived alone with their mother until they were 3-and-a-half, when their mother's poor boyfriend moved in. On her fourth birthday, she was given the white cuffs that Jocelín always wore, though she'd never know what they actually were until later. At six years old, Alina walked into her mom's bedroom to find her dead body on the floor. The boyfriend was nowhere to be found.

She fled across the state with her brother, where they met their grandfather a year later. He took them in and, though he was a mortal, he knew how to fight with knives. He showed her that her bracelets could turn into daggers, and he gave her lessons daily on how to defend herself. But when the two were almost 9, they ran into a group of monsters, which killed their grandpa and chased them for days. Alina returned to Jersey City with Dante, monsters in hot pursuit. When they were 10, Dante was taken by a mysterious group of men and killed, leaving Alina on her own. She sought revenge on the people that killed her brother, and was recruited to Camp Half-Blood when she was 13.