Mylock serves as the loyal butler and retainer to Alman Kido, charged with safeguarding the Kido household. When Vander Guraad's forces attack targeting Sienna Kido, Mylock spearheads the evacuation of both Seiya and Sienna via helicopter. After enemy fire damages the aircraft, he escapes with Sienna using a motorcycle, employing a hidden waterfall passage to ensure her safety. He demonstrates considerable combat skills during protective operations. In one engagement, Mylock confronts and neutralizes four black-armored assailants, revealing advanced combat proficiency and strategic agility. His role extends beyond physical protection to include logistical support, such as piloting aircraft during critical missions. Information regarding Mylock's background prior to serving Alman Kido remains unspecified. Similarly, no concrete information exists about his involvement in events beyond the initial conflict against Vander Guraad or his activities during the Battle for Sanctuary arc.