Place of Birth Lungmen Race Zalak The Rat King is the undisputed godfather of Lungmen's criminal underworld who has reigned over the slums of Lungmen for many years. Due to his chivalrous character and his selfless protection towards others, he is beloved by its residents. From the outside, this Zalak may appear old and frail – having trouble walking even with his cane. But his mastery over sand-based Originium Arts makes the Rat King a formidable opponent in battle nonetheless. Anyone who dare to oppose him has never left the slums to tell the tale.

Spoiler

The Rat King has a daughter named Lin Yühsia who he appointed to be his heiress even though she has not decided to take his place yet.

(Source: Arknights Wikia, edited)