SL-04, also known as Silver, is a mechanicalized robot made of titanium and powered by an artificial power source known as Arcanite. The robot is in the form of a girl with show silver hair and blue eyes. Her creator is unknown, mainly due to her mind being wiped. However, she's is an extremely intelligent robot who can do almost anything a human can do. She appears as a calm, expressionless person, but she can be reprogramed to have on different personalities.