There is Markus.
Markus was given as a present from the creator of the androids to Carl (Lance Henriksen for us who follow him and typically say his last name wrong haha), who is an artist who needs help getting around. This is what Markus was made for and has a unique appearance from other androids.
Carl taught his android to think for himself as well as encouraged higher education. Carl is such a great owner no android wants to leave his side.