When first introduced in Grandma's Day Out, it became evident that she is an incompatible member in the Default family, as Gart desperately wanted to pass his responsibility of watching over her in Robot's hands; Robot was shown to have a bit of intimidation with her as well.
Her linguistics consists mainly in numeric speech known as binary code; the only numbers she utters are 1 and 0; Ex.: 1010. She is mostly known for cursing in her binary code, such as her most common used curse: 101.
She is designed as a 1960's tape recorder with printed paper protruding from the top of her head like hair. Her eyes are usually slanted, though she occasionally opens them.
Her personality as well as her aggression appear very similar to Madame Foster from Foster's Home from Imaginary Friends. They also tend to resort to hitting others with their canes when very angry.
Gart has a portrait of her in his office as well as Robot having a framed photo in his and Monster's apartment.
She has a strong hatred for Organics as revealed in the episodes, "Grandma's Day Out" and "Baconmas," and often curses out about them in binary code that only Mechanicals can understand.