Seiren

Seiren is a beautiful, blue-haired woman who initially appears as Gargantua's ally in the anime. He describes her as a devil, but apparently trusts her, using her aid in his search for Eve. Seiren holds a grudge against Lilith, claiming that she was abandoned by her. She is most upset when they meet again on Milka's island and Lilith doesn't even remember her.

Zerochan