When you... gave me the key to take that heavy thing off... I wanted to believe again.
.....In that hope, and in myself.

–Defect Mogeko, Mogeko Castle

Defect Mogeko


Moge Nega-Mogeko.png

Character Information
Japanese Name 異端モゲコ(Defect Mogeko)
Romaji Name Itan Mogeko
Ura Mogeko
Location Mogeko Castle
Status Deceased(?)
Biological Information
Species Mogeko
Gender Male
Professional Status
Affiliation Mogeko Castle
Personal Status
Relatives King Mogeko (Creator)
Mogeko (Brethren)

Defect Mogeko (異端 モゲコ), Itan Mogeko; Lit. "Heretic Mogeko") is one of the Special Mogekos in Mogeko Castle. He's a deutragonist and acts as a guide for Yonaka Kurai.


Defect Mogeko looks like a green Mogeko, with an X-shaped scar on his torso and a scar on the right side of his face. He is also missing his left ear and tail.


He used to get along with King Mogeko but came into disagreement with him, being branded as a "defect Mogeko," and subsequently imprisoned.

He is considered to be a "defect" by the Mogekos, although there isn't anything defective about him save for deviations from the rest of the Mogekos.

As far as his actual personality, Defect Mogeko is relatively tough but calm, contrasting Yonaka's more emotional reactions to the events throughout the game. He can also be resourceful, thinking to bring a weapon (more specifically, a rocket launcher) from the hospital in the case of an emergency, and even having tear gas to stave off King Mogeko during his and Yonaka's rush to the seventh floor of the castle. He is also unfazed if any harm comes to himself and is more concerned with protecting Yonaka and getting her out of the castle, showing a selfless side to him. While he claims he helped Yonaka since he had nothing better to do, his actions show him having a certain kindness. 


Defect Mogeko is one of the Seven Special Mogekos. His former name was Nega-Mogeko.

After he told King Mogeko that his way was wrong, King Mogeko called Nega-Mogeko "defective" and imprisoned him. According to Defect Mogeko himself, he gave up fighting after he lost his ear.


  • Mogeko Castle- Defect Mogeko appears as a protagonist. Yonaka finds him in his cell when the other Mogekos throw her in prison. She hands him a key she got from the Prosciutto Fairy, which could unlock his restraints. After he unlocks his chain, he decides to help Yonaka escape the castle. He gets shot by King Mogeko later in their journey and sacrifices himself so Yonaka can escape from the castle.


Mogeko Castle Cast

Yonaka Kurai

Yonaka is Defect Mogeko's one-off acquaintance. She was helped by him in order to escape Mogeko Castle.

King Mogeko

King Mogeko is Defect Mogeko's enemy and a former friend. King Mogeko used to be friends with Defect Mogeko when he was still referred to as "Nega-Mogeko." He imprisoned Defect Mogeko after Defect Mogeko disagreed with his ways of ruling, branding him as a "defect."


The two were close friends.


  • Defect Mogeko's actual name is "Nega-Mogeko" because he is the opposite of King Mogeko. The title "Defect Mogeko" was given to him by Yonaka Kurai upon their first meeting, due to her having met him shortly after reading a book on "defective" Mogekos.
  • From June 28 to August 3, 2017, Deep-Sea Prisoner hosted a character popularity poll that let each person vote three of their favorite characters. When the results came out on September 7, 2017, Defect Mogeko was ranked 10th. [1]
  • In Japanese, Nega-Mogeko's name (裏モゲコ) uses 裏 ("under" by DSP's English name choice) in the same way you would refer to a "private" account or a "hidden" message board. Basically, something that outsiders wouldn't know about.


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Mogeko Castle (Original)

Mogeko Castle (Remake)

Official Artwork


Sprite Gallery


  • "Regular killing doesn't satisfy her, so she prefers to torture..." (Defect Mogeko explaining Moge-ko to Yonaka Kurai - Mogeko Castle)
  • "When you... gave me the key to take that heavy thing off... I wanted to believe again......In that hope, and in myself."
  • "...Heh." (Bonus Room)



Mogeko Castle
Mogeko Castle Characters
Major Defect Mogeko · King mogeko · Moge-ko · Mogeko · Shinya Kurai · Yonaka Kurai
Minor Blood Spirit · Hashasky · Hasu · Met · Moffuru · Mogecuckoo · Mogekov Hashasky · Nega-Mogeko · Prosciutto Fairy · Somewhat Strange Mogeko
Cameo Etihw · Froze · Hanten · Idate · Imika Yuhjima · Kcalb · Kurotsuno · Macarona · Mafuyu · Moge-kov · Nataka Kurokawa · Pancetta · Peraco · Rawberry Preserves · Rock · Rocma · Shirogane · Sunosan · Sullivan · Yosafire · Yukisada · Wadanohara

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