Because she was awakened in an incomplete state, before she could download half of her soul from the main body, her memories and personality data are fragmented and unstable. This instability has resulted in the side-effect of a split "personality" of sorts: That of a cool and collected adult woman, and a child-like one that is playful and cheerful, with her voice changing accordingly. The way she refers to others changes as well: her child voice using the honorifics ちゃん (-chan?