(Another version of my sona!)
Rebby was created by a company specializing in entertainment robots. She was custom made to be the mascot of a doughnut shop on a backwater planet. Due to the high crime rate and the cruelty of the people, she was eventually stolen and sold many times, experiencing more and more horrors with each coming day. Unable to take her treatment any longer, the robot broke her programming and ran, stealing a ship to leave the planet. The mechanical rat was chased down and her ship was badly damaged, forcing her to land in an asteroid refueling station. Here she met a rag tag crew of pirates including a ship mechanic who sympathised with her plight. She joined them, becoming the woman's apprentice and learning the ins and outs of engineering. She has become skilled with the use of projectile weapons and has had her programming modified to allow complete and utter freedom.
Rebby is often nervous, but she covers it up with a mask of bubbly happiness. She fears most biological beings, especially humans and will avoid them if possible. Gaining her trust is hard, and not many manage to do so. Her crew is her only family, and she will do anything for them now. This rat's favorite passtime is using the virtual reality machine to play video games. Because she cannot change the expression on her face, she will sometimes wear bandanas or masks paired with cloaks so that others, especially biologicals do not know her true identity.