Meaning "thunder animal/beast" it is a creature from Japanese lore said to be composed of lightning and may take the shape of a cat, fox, weasel, white wolf, blue wolf and even a wolf wrapped in lightning. It may also fly about as a ball of lightning with a cry that sounds like thunder. Raijuu is the companion of the thunder god Raijin. While the beast is generally calm and harmless, during thunderstorms it becomes agitated and leaps about in trees, fields and even buildings.
Raijuu can be contracted within the Old Metro instance and encountered as an enemy variation within Nakano Stone Site silver instance. He can only be fused after completing a quest for the cathedral master in Shinjuku Babel.
"Japanese mythical creatures said to fall to the earth along with thunder. They usually run through the clouds, but come down riding on lightning. They are said to resemble weasels."
—Shin Megami Tensei III: Nocturne profile
Raiju can be found in the Kabukicho Prison as a random encounter. Due to being a demon of the Wilder Race, it can only be recruited during FULL Kagutsuchi or with the Jive Talk skill, otherwise, it must be summoned through fusion.
Raiju can be obtained by letting a Gremlin evolve at level 14. It can teach Flynn the Shock skill through its Demon Whisper. Raiju is one of the demons needed to summon Asterius through special fusion.
Raiju can be found within the Sky Tower or by letting a Quicksilver evolve at level 30. Raiju can teach the Shock, Binding Claw and Tarukaja skills through its Demon Whisper. It benefits from learning Physical and Electricity skills.
Devil Summoner: Raidou Kuzunoha vs. The Soulless ArmyEdit
"A beast of Japanese folklore, said to come down to earth on a bolt of lightning. It usually runs through the thunder clouds, but will also ride bolts of lightning down to the ground."
—Shin Megami Tensei: Devil Summoner: Raidou Kuzunoha vs. the Soulless Army devil chart
"A beast of Japanese lore, said to come down to Earth on a bolt of lightning. It is about 2 feet (60 centimeters) long, with ferret like claws and lives running around in thunder clouds. Other details about the Raiju are depicted slightly differently depending on where the story originates."