Sis

"Sis" is the given name to Ruth's greatest creation and her home.  Sis is a robot of amazing height, and her top half serves as Ruth's home.
On her chest is a monitor that displays her battery in a variety of ways- bars, percents, and more!  So important!
Sis is playful and really loves dolls- but being so big she doesn't understand that humans aren't small figurines.  It makes her upset that she doesn't have big friends to play with her.
Sis is equipped with many weapons as a battle robot, but has never had to engage those features.
Sis recognizes Randy and Rory!  She only calls Randy 'Harrison' however.