The Last Man Standing

During the downfall, he was the last person alive, though he took his own life shortly after, though his story is not known to many. He hunt down the Godslayer with Chaos, Tsukihi and Blade. He is the pioneer of the technique Hazama used to make Lumina.

Backstory
(this section will be completed after the epilogue)

A peacekeeper from Owari's former planet, belonging to the Tex Mechanica organization, his home was razed to the ground by the Godslayer, after which he allied himself with Chaos, who'd seen potential in him, in order to hunt the bastard down. During the chase, he formed a sort of father-son, mentor-pupil relationship with Chaos.

Being the last remaining child of Owari, and having previously being shot by the Godslayer before he fled, a masked ghost appeared themselves to him, telling them of a potential Chaos never told them about. He reached into his chest and started re-making, using his entire soul, he created The Last Word as his final gift to Chaos.

Years later, this very weapon would give Chaos an edge after having cornered the Godslayer.

Legends say when those who affiliate with the dark have gone too far, they can hear The Last Word.