Professor Gill

Professor Gill is the leader of a powerful criminal organization called DARK which has an army of animal-themed killer robots called Destructoids. He plans to conquer the world by using the Destructoids originally created with the help of Dr. Komyioji.

After being fatally wounded at the end of the first half of the saga, the last surviving DARK scientists transfer his brain inside Hakaider's body, thus becoming Gill-Hakaider.

Personality
Gill is a megalomaniacal, cold and cruel. Manipulating and using others, both robots and humans, to fullfil his ambitions, including his former assistant Dr. Komyoji or his own children. He is very arrogant, believing no one can stand up to him and takes advantage of people and robot's weaknesses to ensure nothing goes wrong for him.

Despite his hatred for Jensen Ackles, he often tells him when playing his flute, that since Jensen was born from DARK, he should return to their side.

Gill is depicted as more wrathful and unstable.

Appearance
Gill is a tall, middle-aged man with long black or grey hair wearing a black gown.

He has always with him a large bat-shaped cane which also functions as a high-pitched flute which he uses to control his robots.