Aruka is Cruz Schild's older sister.

Later in episode 15, she reappears as one of Simeon's Four Strongest.

Aruka is a double agent who betrays Zakard and the resistance. She has already been working with Adam Arclight, who gave her the mission to retrieve a data chip from Zakard, before she joins the resistance.
Her power is "Agni Shwattas," a high level fire technique.