In Hinduism, Krishna is the eighth avatar of Vishnu, the Preserver. Described as a blue-skinned young boy playing a flute, he battled many demons and waged war alongside a man called Arjuna. He is a famous deity in the Mahabharata and he is believed to have written the Bhagavad Gita.
"A divine hero of Hindu mythology. He is the eighth avatar of Vishnu, who is said to appear whenever the world is at risk. Name is sometimes translated as "all-attractive." Raised by cow herders. As a boy, he would play his flute, causing women to flock to him. As an adult, he became a great tactician. Shot in the back of the leg by mistake by a hunter named Jara."
—Shin Megami Tensei IV Apocalypse compendium
Krishna interrupts the war between the forces of God and Lucifer as the representative and main leader of the Divine Powers. The two rebuff the interruption of the war by the gods to instigate a three way war between Monotheism, Polytheism, and Danu's fairies (who wish humanity to not be dependent on gods). He intends to manipulate everyone to achieve his objectives. At the beginning of the game, he is sealed within an ark in Kanda-no-yashiro in Tokyo, but Odin manipulates Nanashi and Asahi (with a little help from Dagda, if Nanashi attempts to negate Odin's manipulations) into freeing him. He immediately sets out to convince Flynn to join them as his "Kalki," his own version of the Godslayer. His ultimate goal is to use Inanna to power the Cosmic Egg and force a rebirth of the universe, with himself or one of his compatriots at the center-thus supplanting YHVH as the Creator and permanently claiming the new universe for Polytheism. He has a messiah complex and has an extremely patronizing view of humans, seeing them as expendable in his goal of universal salvation.
To unlock him for fusion, Nanashi must return to Kanda-no-yashiro after defeating Vishnu-Flynn and Krishna will then lend Nanashi his power to fuse him.
Krishna will present himself to Nanashi and company after they reach the center of the Tsukiji Konganji temple and witness Odin being defeated by Flynn. He will attempt to prevent the party from leaving and attack them directly.
Krishna makes frequent use of his Dream Raga and Venomous Raga skills to inflict multiple status ailments on the party per turn, along with the ocassional casting of Zandyne, Ziodyne or Moxagita and buffing himself with Combat Tara. The party can make use of Dekaja and Dekunda to remove his debuffs on the party or buffs to himself. Silent Prayer will also remove all buffs and debuffs. Having Navarre as a partner can grant access to Nanashi's party automatically. However, having Hallelujah as the main partner will prevent the more debilitating ailments from taking hold thanks to his Warding Shout skill, ensuring that the party can work to level the playing field before Krishna's next turn.
Krishna is weak to Darkness skills, and a Pisaca can be obtained from Ikebukuro and be made to exploit this. Tiamat can also be found in Tsukiji Konganji and can grant access to the Silent Prayer skill.
During the battle, Krishna will attempt to convince Nanashi to stop fighting him, offering his hand to Nanashi, with the outcome varying based on Nanashi's decision.
> Will you lay down your sword and take Krishna's hand?
Take his hand
Dagda does not approve Nanashi +Tarukaja/Makakaja x3
In older Japanese, the name for the color blue is the same as the one for the color green: Ao (青, Ao)?, so in a certain sense, he's still "blue-skinned."
Shin Megami Tensei IV Apocalypse's story is a warped allegory for The Fool's Journey. Suprisingly enough, Krishna represents the Temperance Arcana. He acknowledges that Order and Chaos are fine on their own, but that YHVH turns them into depraved extremes that cause human suffering. Vishnu-Flynn further represents this concept with the interchangeable Light/Dark elements during the boss fight.
Krishna's criticism of YHVH has a philosophical underpinning of criticism for the Hobbesian worldview of Christian theology. Christian theologians often argue that the world is Hobbesian due to human nature; Apocalypse Krishna reverses this concept by arguing that any God who allows the Hobbesian world to exist is intrinsically worthless and the blame placed upon human nature is fundamentally misanthropic. Apocalypse Krishna seems to heavily imply that Original Sin itself is misanthropy.