Lui

A personal robot who has been with Takaya for as long as he could remember. Her main objective is to protect him. Living with Takaya, she has also been both a mother figure and a sister figure to him.
Although she has far more advanced conversational and learning functions than other combat-type androids, her main body is not designed for combat. There is only her right arm modified to be useable for military equipment usage. Over time, various parts of her body are also wearing out.