Mouse is a hacker who was once arrested by Bob. She is not above selling her services to the highest bidder - such as Megabyte. However, if you double cross her, beware! She gets even.
Mouse is friendly with Bob (a little too friendly, in Dot's opinion) but mostly keeps to herself.
In season 3, Mouse meets Ray Tracer and immediately falls for him. Who knows where THIS relationship is going to go!
