OVA
Description
Mithos is a half-elven male appearing as a 14-year-old with blonde hair, blue eyes, and a height of 153 cm, though chronologically over 4,000 years old. Originating from Heimdall and later residing in Vinheim, his history traces back to the ancient Kharlan War, where he fought as one of the Four Seraphim alongside his sister Martel, Yuan Ka-Fai, and Kratos Aurion to end the conflict and restore peace. Severe discrimination against half-elves led to their expulsion from Heimdall. Martel's death fractured Mithos's idealism; he twisted her dying wish for a discrimination-free world into a conviction that universal equality required transforming all beings into identical "lifeless beings" devoid of individuality and racial distinctions.

To realize this vision, Mithos founded Cruxis to manipulate Sylvarant and Tethe'alla, establishing the Church of Martel to deify his sister and dominate religious and societal structures. Using advanced Exspheres called Cruxis Crystals, he mutated half-elves into near-immortal angel-like entities, sacrificing their humanity for uniformity. These crystals enabled hosts to survive bodily destruction unless the crystal itself was shattered. Simultaneously, he spent millennia engineering bloodlines to create a vessel matching Martel’s mana signature for her resurrection, orchestrating decline and prosperity cycles between Sylvarant and Tethe’alla to leverage their shared mana supply.

Mithos infiltrated Lloyd Irving’s group disguised as a wounded boy encountered by Genis Sage. Posing as an innocent outsider, he gifted Genis panpipes to manipulate the party’s movements and gain trust. Privately, he confided weariness and doubts about his methods to Lloyd’s pet Noishe, revealing his first internal conflict since Martel’s death. His dual identity allowed covert operations as both the child Mithos and his angelic alter ego Yggdrasill, Cruxis’s leader. He later intervened to save Genis at the Tower of Salvation, inadvertently dropping the panpipes and sowing suspicion.

His plans culminated in reviving Martel’s consciousness through Colette Brunel in the Hall of the Great Seed. Martel condemned his actions and rejected his lifeless-world vision. Enraged by her disapproval, Mithos attacked Lloyd’s group. After physical defeat, his essence retreated into his Cruxis Crystal, retained by Genis. Mithos attempted to possess Lloyd or an ally to flee to Derris-Kharlan, intending to sever the celestial body and rebuild it exclusively for Martel and himself. Confronted again there, he desperately appealed to each party member to join him, but all refused. In his final battle, he sought to destroy the existing world and create a new one. Defeated, he expressed no remorse, vowing to repeat his choices. Lloyd shattered his Cruxis Crystal, ensuring his destruction.

Animation adaptations depict his infiltration earlier, joining after Ozette’s destruction to manipulate events more directly via his child form. Key differences include summoning spirits like Aska with the panpipes and accelerated confrontations. These adaptations streamline his arc while retaining his core motivations: an unyielding pursuit of a discrimination-free world, warped by grief and executed through manipulation and cosmic engineering.