There are some, and they are important:
In this paper we report our study on the user experience of robot vacuum cleaner behavior. How do people want to experience this new type of cleaning appliance? Interviews were conducted to elicit a desired robot vacuum cleaner personality. With this knowledge in mind, behavior was designed for a future robot vacuum cleaner. A video prototype was used to evaluate how people experienced the behavior of this robot vacuum cleaner. The results indicate that people recognized the intended personality in the robot behavior. We recommend using a personality model as a tool for developing robot behavior.
A summary discussion is here, interesting throughout. From this paper you can surmise a bit about the origins of religion, the seen and the unseen, and the demand for conspiracy theories, in addition to robot vacuum cleaners.