Mouse
"Trust me…"
Mouse is a hacker whose origins and motives are, for the most part, unknown. She is a mercenary who will work for anyone if the price is right. Guardian or Virus, she would never take sides.
Her and Bob seem to share a past together. She claims to have known Bob longer than anyone else has, and it's my speculation that they were once a couple.
After Bob had been shot off to the web, and Megabyte began his hostile takeover of Mainframe…Mouse took a stand. She now is helping Dot in her efforts to ward off the viral attacks. Her days as a mercenary seem to be over…at least for now.