In Japanese mythology, Yatagarasu has the appearance of the great bird and represents the will of heaven or divine intervention in human affairs. Although Yatagarasu is mentioned in a number of places in the Shintō canon, there is very little explanation, and much of the material is contradictory. This great crow was sent from heaven as a guide for Emperor Jimmu on his initial journey from the region which would become Kumano to what would become Yamato. It is generally accepted that Yatagarasu is an incarnation of Taketsunimi, but none of the early surviving documentary records are quite so specific. None of the sources mention about it having three legs either, and it may have been influenced by the Chinese sun bird Huoniao.
"Origin: Japan. A three-legged bird who lives in the sun. When Emperor Jimmu was on his eastern voyage, it descended from heaven to guide him. Kamotaketsunumino-Mikoto took this form when he descended on Amaterasu's orders."
—Shin Megami Tensei A-Mode DDS Dictionary
Shin Megami Tensei III: Nocturne
"A divine creature in Japanese mythology. They are three-legged birds sent by Amaterasu to help humans. It is said that they helped Emperor Jinmu claim victory."
—Shin Megami Tensei III: Nocturne Compendium
Shin Megami Tensei IMAGINE
"A divine being worshiped as an incarnation of the sun. It was sent to the earth by the Japanese sun goddess Amaterasu. It takes the form of a pitch-black crow with three feet. As a very high-ranking deity, those who are not worthy are said to be driven mad by the very sight of it. Yatagarasu is also a god of guidance. A well-known story in Japanese mythology tells of Amaterasu sending Yatagarasu to guide Emperor Jinmu to victory in his conquest of the East and return him safely to his home of Yamato. Crows are revered as incarnations of the sun. Their black bodies are said to represent the black color of sunspots. Yatagarasu is worshiped as a symbol of the Kumano Hongu Taisha shrine. This custom is believed to stem from the fact that crows have long been revered as agents of the gods in the Kumano region."
—Shin Megami Tensei IMAGINE Compendium
Shin Megami Tensei IV
"A divine creature in Japanese lore. They are three-legged birds sent by Amaterasu to help humans. They are said to have helped Emperor Jinmu claim victory."
—Shin Megami Tensei IV Compendium
Shin Megami Tensei IV Apocalypse
Yatagarasu can teach Nanashi the Maragion, Grand Tack and Maragidyne skills through its Demon Whisper. It benefits from learning Gun and Fire skills.
Devil Summoner: Soul Hackers
"A divine creature in Japanese lore. They are three-legged birds sent by Amaterasu to help humans. It is said that they helped Emperor Jinmu claim victory."
—Soul Hackers 3DS Compendium
Devil Summoner: Raidou Kuzunoha series
The Yatagarasu represents divine will and orders are communicated by its representative, the Herald of Yatagarasu. Yatagarasu itself is never seen, although the three pines seen in the Kuzunoha Training Hall may symbolize Yatagarasu.
At the end of Soulless Army, it can be assumed that the black bird observing Raidou at the end is, in fact, Yatagarasu.
"A divine creature in Japanese myth. They are three-legged birds sent by Amaterasu to help humans. It is said they helped Emperor Jinmui claim victory."
To achieve the 7th rank of the Empress ArcanaSocial Link, the player must present Margaret with a Yatagarasu that possesses the skill Megido. There are two methods of achieving this fusion; one requiring two fusions, the second requiring only one.
The first can have Tao Tie be fused with Cu Sith, which will create an Ares with Megido. Then fusing the Ares with a Black Frost will create the required Yatagarasu. The second method involves fusing a level 39 Samael with a Mothman for the same effect.
DemiKids Light & Dark
"This demon-crow never gets lost thanks to an outstanding sense of direction."