She strongly resembles the mermaids of legend with her fin. Seiren's hands also resemble fins. Her wings are floating around her.
Killed by Chaos, who stole her power.
- The Man of Synapse is her master, as well as her creator.
- Tomoki Sakurai-enemy
- 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 water up to 8000 meters deep.
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