Mahamayuri is a female (though male in some depictions) bodhisattva of the Buddhist 5 Vajra-rajas (wisdom kings) in Mahayana Buddhism. They are personified by peacocks because of their habit of preying on snakes (nagas) and symbolize the resistance of terror and disaster. Her origins are said to derive from an Indian goddess of the same name. She is also the name of one of the five protective goddesses in the Buddhist Pantheon. In Vajrayana Buddhism, he is thought to be one of the avatars of Gautama Buddha.
Despite being associated with the Wisdom Kings, Mahamayuri tends to be portrayed with a benevolent expression rather than a wrathful one. She has three faces and six hands. She is portrayed riding a top a peacock and commonly sporting four arms. Although the items she holds varies among traditions, common items include a citron, bael fruit, lotus flower and a peacock tail feather. With the moon as a backrest, wearing peaceful ornaments and garments.
According to legend, during the primordial times, the original Phoenix (Feng Huang), the leader of flying beings, gave birth to the peacock Mahamayuri and the eagle Golden Winged Great Peng. The peacock once consumed the Buddha, who however managed to escape via cut her stomach. The Buddha intended to kill the peacock, however the deities told him to stop, thus the Buddha promoted her to be his godmother, therefore the eagle would be his uncle
In Japan, he is known as Kujaku Myo-O (Peacock Wisdom King) and is also revered as a god of mysticism and magic, prayed to in times of drought, poisoning and disaster, believed to convert ills of the world to one's gain with his power. According to legend, En no Ozuno consistently practiced Buddhist magic of her power as her repertoire, laying the foundations for the magical arts of Shugendo and Onmyodo. She was known as Kǒngquè Míngwáng in Chinese, Khổng Tước Minh Vương in vietnamese or Mahāmāyūrī Vidyārājñī.
Mahamayuri is a foreign demon from India who has taken over Shinjuku in Infernal Tokyo. He has placed a Domain in Shinjuku's underground district and rules from there. He questions who Flynn and company are and tells Akira that he's never heard of him when he introduces himself. He calls Akira foolish for thinking he can oppose him and that they will not leave there alive. As the battle starts, he tells them that power rules the world and that he shall bring all his might to defeating them on the battlefield, asking if they can overcome the power that reigns in the land.
He then summons the Yaksha Horde. After their defeat he joins the battle and congratulates the Samurai upon his own defeat, crumbling afterwards.
Shin Megami Tensei IV Apocalypse
"Known as Kujaku Myo-o in Japan, he is known to remove misfortune, fear, and poison. This is due to the fact that he is the deification of the peacock, which eats poisonous snakes. He is often portrayed as riding a peacock, holding a lotus or peacock feather, and has a graceful expression, unlike the other Wisdom Kings that are depicted in more wrathful fashion. In Shingon Buddhism, founded by the monk Kukai, it is said he is an incarnation of Buddha, taking that form to enlighten people."
"Known as Kujaku Myou-oh in Japan, he is known to remove misfortune, fear, and poison. This is because he is the deification of the peacock, which eats poisonous snakes. He is often portrayed as riding a peacock, holding a lotus or peacock feather, and with a graceful expression, unlike the other Wisdom Kings that are depicted in more wrathful fashion. In Shingon Buddhism, founded by the monk Kukai, it is said he is an incarnation of Buddha, taking that form to enlighten people."