メイメイ

A maid droid who works at the observatory, an ancient ruin above the Blastline. Her main job is to manage the security of the tower. She appears in front of doors as a hologram and unlocks them upon verifying that the person attempting to enter is allowed access. She is often sleepy and needs to sleep often to recharge her power. [Edited from Ar Tonelico Official Site and A Reyvateil's Memory Wiki]