Lord of the Revel, summoned by the Kojin tribe in an act of desperation.
From the myriad of deities housed within the three sacred treasures of the Kojin, Susano stepped forth to answer their pleas for deliverance. This divinity of the sea sees battle as a celebration, but challengers will find no revelry nor mercy at the edge of his fabled blade, Ame no Murakumo.Official site description
Revered by the Kojin, Susano's essence was contained within the three treasures: The sword Ame no Murakumo and the mirror kept by the Red Kojin in a treasure vault on the Isle of Zekki, while the Yasakani-no-Magatama gem was lost and long sought. When the Warrior of Light obtained the Yasakani-no-Magatama and took it to Zekki as a means to force all Red Kojin to abandon their post in the imperial army, the hero unknowningly restored Susano. Creating his physical form, Susano awarded the adventurers with a contest of wills on behalf of the Red Kojin. The Warrior of Light defeated Susano, fleeing the isle while Alisaie Leveilleur held off the Red Kojin.
When the party used the spaceship Ragnarok to reach Ultima Thule, the beast tribes summoned benevolent iterations of their primals using the Mothercrystal, with Susano being one of the ten summoned. After encouraging Garuda to do likewise, he gave his power to the Ragnarok, allowing it to achieve the propulsion needed for the Scions of the Seventh Dawn and the Warrior of Light amongt them to reach their destination.
Susanoo-no-Mikoto is the Shinto god of the sea and storms. He is the brother of Amaterasu and Tsukuyomi. All three of them were born from Izanagi. Susanoo used Totsuka-no-Tsurugi as his weapon.