Siren 235236.png
Kanji: セイレーン
Romaji: seirēn
Others: Eta
Generation: Second
Gender: Female
Species: Angeloid
Height: Unknown
Weight: Unknown
Master: Master of Synapse
Type: η (Eta)
Class: Underwater Warfare
Wing Type: None
Occupation: None
Debut (Manga): Chapter 45
Debut (Anime): -
Appears in: Manga
Seiyuu: -
English Voice: -

Seiren (セイレーン, seirēn?) is a 2nd generation, Underwater Warfare Angeloid type η (Eta) (水中戦闘用エンジェロイドタイプη(イータ), uichūsentō-yō enjeroido taipu (Īta)?) built by the Master of Synapse.


She strongly resembles the mermaids of legend with her fin. Seiren's hands also resemble fins. Her wings are floating around her.


Seiren was impaled in the back by one of Chaos's wings before being devoured, and absorbed by her just after she was ordered by the Master of Synapse to kill Tomoki Sakurai and Ikaros.

She is abruptly killed by Chaos, who stole her powers via the Pandora System.


Master of Synapse


  • Seiren appearance is based on the Seiren of Greek mythology.
  • Even though an Angeloid's weakness is water, Seiren is able to work underwater.
  • Seiren can be in the deepest parts of the Ocean up to 8000 meters deep.
Community content is available under CC-BY-SA unless otherwise noted.