CZ2I28 Delta is an automaton battle maid and member of the "Pleiades Six Stars," the battle maid squad of the Great Tomb of Nazarick. With her being an Automaton she doesn't show much in the way of emotions, she'll almost always speak in a flat and emotionless tone of voice, much like that of a robot.  even if she did try to show emotions it would still sound very robotic in how it is said. 

Since she has few lines in volume 1, the other two lines in this casting call are from volume 3 and pure pure pleiades.