De Niro (デニーロ) is Miyu's invention who serves as her attendant. An egg shaped robot with a mouth, not radio controlled but an advanced AI that gives him free will and thoughts and also a bullying attitude. Likes to molest electronic appliances.
The robot De Niro has an arrogant attitude and can be short-tempered. Yet it's funny and also loyal to his master such as Miyu.