Mare

Mare (メア) is an artificial intelligence residing in Van Arkride's Xipha unit.

Appearance
Mare is a very small, pixie-like girl with pointed ears and a vibrant blue glow. She has violet eyes and bright green hair which is tied up into platts and braids. A large circular headpiece which resembles an aerial has two long blue sashes ending in white pointed tips which give her the appearance of having twin tails. Mare wears a skin-tight white leotard with blue elbow length gloves and thigh-high stockings with silver bands. She also wears white boots, a hood like attachment round her collar and what appears to be a blue ornament in the shape of a neck tie with a long flowing diaphanous material flowing from it. Two cords with what appear to be audio jacks hang from her hood.

Personality
Despite being an extremely self-assertive type, Mare initially has no "free will" and its personality is merely a facade of its artificial intelligence. After a certain incident, it showed a free will impossible for an artificial intelligence.

Background
Like other Hollow Cores, it usually provides support through voice guidance, but around Van, it materializes in the real world as a hologram-like avatar after a "certain" occurrence. When that happened, Mare gained newfound sentience, and Van’s body was "covered in a nightmare"… transforming him into Grendel, who wields incredibly explosive power.

Mare is an AI that lives in the Hollow Core of Van Arkride's Xipha. She can manifest in the real world and can trigger a transformation in Van, turning him into Grendel, the Nightmare-clad. She also has the ability to possess Yumé, much to the chagrin of the party.

Later when Van transforms into a demon and is almost forced out of plane that the human resides in, Mare gives hint on where to find him. It's also later revealed that the Mare the party knew wasn't actually Van's Xipha AI, but was actually someone from other planes using the AI's identity and appearance to interact with Van.