Hypnos

Hypnos (ヒュプノス, Hyupunosu)  is a recurring demon in the series.

History
Hypnos is the personification of sleep in Greek Mythology, son of Nyx and brother to Moros and Thanatos. He lives in a cave with the entrance dotted by narcotic flowers. Hypnos is often depicted as a young man wrapped in poppy stock, a horn in his hand, and sometimes wings on his head.

Appearances

 * Devil Summoner: Yama Clan
 * Megami Ibunroku Persona: Night
 * Persona 3: Fortune Arcana
 * Persona 3: FES: Fortune Arcana
 * Persona 3 Portable: Fortune Arcana
 * Shin Megami Tensei Trading Card: Card Summoner: Yama Clan

Shin Megami Tensei: Persona
Hypnos appears as the boss of the Hypnos Tower in the Snow Queen Quest. The Snow Queen granted Hypnos as a guardian to Kumi Hirose, which she used to put the school faculty and students to sleep so they could live their dreams forever.

Persona 3
Hypnos is Takaya Sakaki's artificially summoned Persona, born from the experiments performed by the Kirijo Group. Suprisingly enough, Takaya is able to summon Hypnos without the aid of an Evoker. Hypnos appears as a disfigured body held in the air by wings seemingly grafted into his spine.

Persona

 * Level and HP are dependant on the order in which the towers are conquered and whether or not the Protagonist pinched Kumi Hirose in the Dream World.

Trivia

 * Hypnos appears as a palette swap for Ceasar in Persona 4 Arena when using Akihiko Sanada's Takaya palette swap.
 * It is possible to hack Hypnos for the Protagonist to use, but unlike party member Personas, he has no voice clip for Hypnos and the game will crash if attempting to use it. Most likely, this was just to test Hypnos would function like other Personas. There is a picture of Hypnos amongst the rest of the Personas, however, which is also likely for testing purposes.
 * As a reference to him being the god of sleep, Hypnos wears a mask over his eyes, similar to a sleep mask.