Guardian

The Guardian is a humanoid covered in white fur with a pale face, including the inside of his large ears. He wears a cowhide hat, which belongs to Dipsy.
He is a white-furred Teletubby whose role is to secretly monitor the main quartet on Main Earth for an unknown organization as part of a series of experiments. As part of his monitoring, the Guardian records their well-being, their activities, and prevents them from leaving the area where they are being experimented on. Over the time he spent observing the quartet, the Guardian developed a strong bond with the four test subjects, even though they were unaware of his existence.