From itch.io:
“I heard about it later, and when they called us blasphemers and demon-creators, I always thought of him. Robbie was a non-vocal robot. He couldn’t speak. He was made and sold in 1996. Those were the days before extreme specialization, so he was sold as a nursemaid—” - I, Robot
In Positronic Potentials: The Nanny, you play as a non-vocal robot whose role is that of a nursemaid for a child. You weren’t necessarily designed specifically for this role, though it holds a great importance to you, as does your relationship with the one under your care.
You have a “positronic brain” and your mind is at least somewhat comparable to that of a human. You are able to consider yourself and the world around you. How closely your thoughts and feelings compare to humans, and how you relate to them, is up to you.
While not designed to be able to speak, you are able to communicate through gestures and sign language. The child you care for is able to understand you for the most part.