Leiko Tanaka (田中麗子 in Japanese) is the mother of Noriko Null. A cold and ruthless schemer, she's had many roles: heiress to the Tanaka estate, CEO of the Scion Corporation, secret leader of the Empire of Shadows, former Minister of Defense of Japan, former aide to the Winter King.

She's the current Ice Queen of the Winter Kingdom.


Leiko is the only daughter of businessman Daichi Tanaka and professor of archeology Noriko Tanaka; her two brothers died of overdose before she was 15 years old. After her mother's brain was damaged for attempting to interface with the Core, Leiko grew under the influence of the alien device and the harsh ubringing of her father. Discovering that the Heart Of The Universe was in possession of Bob Null and that the only way to activate it was by being pregnant, she conceived the child that would one day grow to be Noriko Null. Leiko was recruited in the Mortal Liberation Front and acted as their secret agent on Earth; Noriko grew up without knowing the identity of her mother.

After Leiko revealed herself to Noriko 18 years later, Athena activated the Nexus that the Mortal Liberation Front had installed into her brain during the pregnancy. Mother and daughter would soon start a bitter rivalry, leading to the Scion Corporation takeover by Null Technologies. Later, by using technology stolen from Noriko and with the Core's help, Leiko founded the terrorist organization called the Empire of Shadows and used the identity of Empress of Shadows. Leiko has also formed secret alliances with Hermes, Eris, the Scribe and the Mist.
SPOILER WARNING: after Beyond The Impossible #175-194
During the Guild invasion of Earth, Leiko was almost able to conquer the entire planet and steal control of the Nexus but was ultimately defeated by her daughter. Exiled on Boreas by the Heart Of The Universe, she befriended the Winter King and became his trusted advisor.
SPOILER WARNING: after Beyond The Impossible #238-257

She convinced the Winter King to invade Earth and recover the Vial of Destiny and access to Lar technology. After the Winter King was defeated by Noriko Null, Leiko killed him, claiming his armor and the title Ice Queen


Leiko is a human with no powers. Her mind has been altered by the Core, boosting her intelligence and giving her easier access to alien technology; it may also be responsible for her total lack of empathy.
SPOILER WARNING: after Beyond The Impossible #255
Winter Armor: virtually indestructible, the armor allows the user to create, shape and manipulate ice for various effects.

Vial of Destiny: Leiko wears the Vial at all times. Containing the last known samples of Drylon DNA, the Vial makes her immune to the powers of the gods and to the Blood.


  • While arguably the weakest of all the Vanguard's enemies, she's the only adversary from the first 50 issues still around
  • Leiko was selected as Time's Person Of The Year before her daughter, much to Noriko's annoyance
  • She's been shown to speak both English and Russian fluently. She likely knows Olympian as well.

Defining episodes