Muthr

Muthr is Eva Nine's robot helper. She has helped Eva since she was a artificially born baby, and strongly believes that the outside world is a bad place to be. Being an older model, Muthr (Multi-Unit-Task-Help-Robot) counts on technology dated centuries ago, which turns out to be wrong. Although she loves Eva dearly, she must let her go when a giant beast named Besteel breaks into their sanctuary, sending Muthr and Eva seperate ways. Created by Cadmus Pryde, there are many others like her. The three-armed robot is a noble and stubborn machine. She has raised Eva since birth, and had never let her outside before the break in.

History
She also raised Eva Eight in the same sanctuary, but forced her to move out after 16 years of raising her and never took Eight back. Eva Eight then reunited with Eva Nine in A Hero for WondLa. Eva Nine told Eight that it wasn't Muthr's fault that she wouldn't take her back, but the sanctuary's programming. After forgiving Muthr, Eva Eight finally moved on from the past.

A Hero for WondLa
In the beginning of A Hero for WondLa, we learn that Muthr died trying to protect Eva. Eva then must let her go, but it is a painful process.