Ose

Ose is a demon in the series.

History
The 57th spirit of the Goetia and a great President of Hell. He first appears as a leopard, but after some time will take the form of a man. He gives skill in all liberal sciences and true answers concerning divine and secret things. He can change any men into any shape the exorcist may desire, and the one that is changed will not know it. He can also put them in a state of insanity on which the victim will believe that their identity has changed. The delusion, however will only last for an hour. Ose governs over 30 legions of spirits.

Appearances

 * Shin Megami Tensei: Fallen Race
 * Tokyo Revelation: Main Antagonist
 * Shin Megami Tensei III: Nocturne: Fallen Race, Boss, Hallel Race (Boss), as Ose Hallel
 * Shin Megami Tensei IMAGINE: Fallen Race, Divine Race, as Ose Hallel
 * Shin Megami Tensei: Strange Journey: Fallen Race
 * Shin Megami Tensei IV: Fallen Race
 * Last Bible III
 * Majin Tensei: Fallen Race
 * Majin Tensei II: Spiral Nemesis: Fallen Race
 * Giten Megami Tensei: Tokyo Mokushiroku: Fallen Race
 * Persona 3 / FES / Portable: Fool Arcana
 * Persona 4 / Golden: Fool Arcana
 * Persona Q: Shadow of the Labyrinth: Fool Arcana
 * DemiKids Light / Dark Version
 * Shin Megami Tensei Devil Children: Light & Dark: Minor Antagonist
 * Devil Children Puzzle de Call!
 * Digital Devil Saga: Avatar Tuner 2: Nether Class

Tokyo Revelation
Ose appears after the summoning ritual involving Saki is completed, his body towers over many buildings and he does not speak. He proceeds to fight Masakado and Cerberus, but is being easily beaten by them. In order to counter this Gagyson offers his life to his master, which gives Ose wings, tusks, and birdlike feet. Despite this, he was still losing until Masakado let his guard down, after catching Masakado in his hand Ose's lost arm regenerates thanks to his unlimited supply of magnetite coming from Saki. Once he loses his unlimited supply of magnetite Masakados finishes him off in one blow.

Shin Megami Tensei III: Nocturne
Ose appears in the Assembly of Nihilo as a boss and drops the Anathema Magatama after the Demi-fiend defeats him. An all white version of Ose appears next to Baal Avatar. This Ose is Ose Hallel, who aids Baal Avatar along with Flauros Hallel.

Shin Megami Tensei IMAGINE
Ose can only be acquired through fusion and appears as a boss in one of the final acts and as support for many of the bosses following his act-- in particular he appears alongside Flauros in the Distortion boss room. In Act 18 he faces off against Andras, Azura, and the player character, summoning Berith and Orobas to aid him. After losing he is disappearing as his two allies have already vanished. He uses the last bit of his strength to strike down Andras, only for Azura to take the blow meant for him, vanishing afterwards.

During the Basilica activation quest, the player encounters Ose Hallel when it kills a Demon Buster in front of them, scoffing that humans are weak no matter which world they belong to. After the fight, he leaves, but reappears to confront the player and Azura in Nakano, where he is fought off by DB Kuroe. He appears alongside Flauros Hallel as the third boss fight in End of Days Ichigaya. After obtaining his plug-in, players are able to fuse this variant in a special double-fusion of Ose and Throne.

Shin Megami Tensei: Strange Journey
Ose appears as a common enemy in Sector Fornax's basements.

Shin Megami Tensei IV
Ose is summoned by the Terminal Guardian at the third terminal to defeat the prentice Samurai. His defeat leads the terminal to return to normal.

Giten Megami Tensei: Tokyo Mokushiroku
Ose is fought in the underworld and drops the Sword of Kusanagi after his defeat.

DemiKids Light & Dark Version
Known as Ozemos, he appears as a boss guarding one of the doors in the final dungeon, Dark Castle Tyrnanog. Stating that Jin's quest to defeat the Imperium will end here. After his defeat he is impressed by Jin and states that Imperius waits ahead.

Shin Megami Tensei Devil Children: Light & Dark
Ose is one of the three commanding officers of Remiel. After fellow officer Crocell is defeated, he takes action in going against the Devil Children, sending Raphael to act as a spy while sending other servants like Poseidon and Ameretat to take them down. He later invites the group into his castle by letting them believe he is giving them the tool they need to defeat his master, only to challenge Jin and Akira to battle. Once Jin proves he has what it takes to defeat Remiel, he gives him the item. The last officer Gemori appears before them and tries to kill both him and Jin, with Ose protecting Jin and dying in the process.

Devil Children Puzzle de Call!
The second boss faced by Rand, Ose is found in the village stage. He uses lightning to strike down a vertical row.

Shin Megami Tensei III: Nocturne
Boss= Summonable Ally=

Shin Megami Tensei IV
Boss=

Summonable Ally=

Giten Megami Tensei: Tokyo Mokushiroku
Boss=

Summonable Ally=

Persona 3
Persona 3=

FES / Portable=

Trivia

 * Ose was one of the very first demons to be confirmed for Shin Megami Tensei: Strange Journey since he was in a scan related to fusions.
 * Ose in Tokyo Revelation is called Satan in the English dub, but is called President in the original Japanese version.