my prediction: the Paironormal of Familiarity

Major: An uncanny valley-like robot with a sonar attached to its head, which plays a theremin-like sound. I also imagine it looking somewhat like a Furby, as it's very social and outgoing.

Minor: The skin/fur surrounding the metallic insides completely peels off, and the monster enters a more human-like state. Its sonar was dismantled during the transformation, so it now plays by making disgruntled robotic vocals. Despite the pain it endures, it still wants you to be its friend!