"Ha ha ha. So you're finally here. I've been waiting for this moment ever since Azazel assigned me here. I've been going insane in these stagnant days without battle... But my personal hell has finally come to an end."
—Shemyaza, Soul Hackers
Shemyaza (シェムハザ shemuhaza) is a demon in the series.
Also known as Shemhaza or Samyaza, it is a fallen angel in Jewish and Christian apocrypha whose name means "infamous rebellion". He is the leader of a group of angels called Grigori (Watchers) who abandoned Heaven to mate with human women and gave birth to the Nephilim. They taught humans various creative arts.
"A fallen angel found in the Book of Enoch, where he gave a human knowledge of God. The Grigori, a group of angels which descended upon the earth to watch humans, instead began to lust for women. Because of that, God marked them with the stigma of fallen angels. They also taught humans warfare, which angered God and caused him to send the Great Flood. Samyaza is a leader of the Grigori. "
Appearing as a member of Lucifer's faction he is Hallelujah's father who harbors a big hate towards, he is fought twice, the first in Tokyo by the protagonists, after his death his son expres great happiness for killing his father. The second time is inside the Cosmic Egg where he is summoned by Inanna alongside Baal and Beelzebub where is killed a final time.
Working for Azazel, Shemyaza took a human form and was assigned as the factory manager at Algon Microelectronics. His task was to insure that the krypto chips were at maximum production. Shemyaza found this job to be unbearable because he was a battle and murder loving psychopath and thus unsuited for an office life style. He gained a fearful reputation from his workers who believed him to be machine like and totally devoted to his work, unaware that the negative feeling they got from him was his repressed desire to go nuts and massacre them all.
When the Spookies investigate the Krypto Chip's documentation and discover its true purpose of accumulating souls, Shemyaza appears and informs them they won't find anymore answers behind the Phantom Society's goals, and alludes that the Society knows their every move. He also thanks them as Nishi had told him about them and, realizing that they would probably make it to him, it gave him a bloody battle to look forward to while he continued to endure his work.
While they stall for time, Spooky manages to copy the Krypto Chip, and the protagonist hold him off while the others escape. Upon defeat, he initially seems content with his death, declaring that Azazel and Satanael can still kill them. Then he suddenly realizes that Nemissa is standing before him, and begins to panic as he dies, since she could still compromise their plans.