A important character featured in Galaxies of War. He is a rebellious fighter, allying with John and Luna to destroy the empire. He is a trained soldier who turned away from the empire after the big massacre. He meets John and Luna in a little pub, from where they also add him to their group. He is often joking and teasing John and Luna saying that he senes a romantic-sexual tension. He is killed in the betrayal during a important battle. Before he dies, he detonates a bomb, allowing John and Luna to flee. After his death, John makes a secret grave for Sebastian, and lies one single rose on it.