The 64th spirit of the Goetia. He is a great duke and appears at first as a mighty terrible and strong leopard but at the command of his summoner he assumes the shape of a man with fiery eyes and a terrible countenance. He can see the past and future, but unless he is commanded into a triangle he will lie in all those things. He will gladly talk of divinity and of the creation of the world, and of his and other spirits' falls from grace. He can control fire and burn all of his and his summoner's adversaries to death and will not suffer them to be tempted by any spirit or otherwise. He governs 36 legions of spirits.
Flauros makes his first and only non-Fallen appearance as an angel dubbed Flauros Hallel fighting alongside Chiaki Hayasaka after she has assumed the form of the Baal Avatar. There is no way to recruit this form of Flauros into the player's party.
Flauros' Fallen form, however, appears throughout the game, even before the aforementioned fight, as an enemy in random encounters.
Shin Megami Tensei IMAGINE
Flauros acts as the final boss of the main story's Distortion instance. In completing the Distortion instance for the first time, players obtain the ability to fuse him. He's a special double-fusion of Queen Mab and Uriel or Scathach.
In the End of Days Ichigaya instance, he appears as the third boss fight after Mother Harlot and Abaddon as Flauros Hallel alongside Ose Hallel. After obtaining his plug-in, it is possible to fuse him in a special double-fusion of Flauros and Throne.
Persona 3
"One of the 72 demons of the Goetia. He appears as a leopard and can see the past and future. He can control fire and burn all his adversaries to death."
—Persona 3 Compendium
Devil Children Fire/Ice Book
Flauros can only be created through Relic Fusion, first as Flauroszombie, which can then be fused with his soul to become Flauros. Flauros is an angel in the Tower of Babel, where he appears on the third floor whenever Akira touches the side of the partially invisible pathway, sending him back where he came and either reducing his HP or losing his demons as an act of revenge for walking down the path he created.
Devil Survivor 2
"One of the 72 demons of the Goetia, appearing as a leopard-faced warrior. He has the power to see the past and future. He can also control fire and burn anything his summoner wishes."
I'm Flauros the Fallen, a great guy who's smokin' hot! Nice meetin' ya.
Hell yeah, let's do this! Try to pick your jaw up off the floor when you see the new me.
Gallery
Artwork from Shin Megami Tensei
Flauros Hallel's artwork from Shin Megami Tensei III: Nocturne
Artwork from Persona 3
Artwork from Persona 4
Model in Shin Megami Tensei III: Nocturne.
As he appears in Shin Megami Tensei IMAGINE
Flauros as he appears in Devil Survivor 2.
Trivia
In Kazuma Kaneko Works III, the commentator admitted that the revised artwork of Flauros has inspired the game designers to make him more physically oriented, contrary to his traditional depiction of a mage capable of casting fire. This goes as far as in Shin Megami Tensei III: Nocturne and Digital Devil Saga 2, he does not know a single fire spell innately.