User blog comment:Jopjopjop/SlashDog/@comment-104.7.80.176-20150615013831/@comment-16281343-20150615015316

Four Fiends are beings sealed inside independent avatar type Sacred Gears.

Two of them is already known and is on Tobio's team. They are still looking for the rest.

Four Fiends
 * Chaos
 * Gluttony
 * Ignorance
 * Samejima Kouki - possessor
 * iaSG -> white cat named Biyakusa that can transform a spear
 * further morphs into a sabre-tooth tiger that has power over lightning.
 * Deviousness
 * Minagawa Natsume - possessor
 * iaSG -> eagle named Gryphon
 * further morphs into a gryphin that has power over wind.