Mouse is a hacker program that is capable of unauthorized access to any System. She speaks with a sugary Southern accent and has fangs. A hacker extraordinaire, she is equipped with a katana to cut her enemies into small pieces and a high-tech craft simply called Ship. Sometimes she is seen with another, smaller sword, but she rarely uses it. Mouse is notoriously difficult to catch, or to keep imprisoned. It is unknown what System Mouse originated from.
Mouse's symbol is a drawing of a real mouse, which she has on a ring on her right hand. Whenever she needs to secretly leave somewhere she will leave her symbol printed on a wall or door. Her ring is also capable of giving off a small energy pulse capable of sealing someone in a Liner Stasis Field, or temporarily blind someone to allow Mouse to get away.
A long time ago Mouse was arrested by Bob when she tried to hack into the Super Computer. Somehow, she escaped the Guardians justice system.
At some point she was also captured by the pirates of the Saucy Mare and held captive in their brig by Mr. Jimmy. Until they captured Bob, she was the only one to ever escape the ship's brig. As usual she left her mouse symbol on the wall of the brig, leaving a small hidden file space behind. This later enabled Bob to escape by hiding in the hidden file until the pirates opened the door.
As a Hacker, Mouse occasionally did business with viruses, once being hired as a mercenary by Megabyte. While she was working for him, Mouse didn't use Megabyte's real name, preferring to call him "big guy" and "Megababe". Megabyte hired her to go inside Bob's brain and hack the access codes to the Super Computer. His viral agents messed up and her shrunken ship ended up in Enzo Matrix's brain. When Megabyte found that Enzo was inside the Principal Office, he tried to use him to gain access to the Core. She turned against him when it became obvious, she had been double-crossed and was endangering a young child.
The ReBoot Multiuniverse[]
Her emblem was seen during the attack on the Energy Sea inside the cargo/prison chamber in the Saucy Mare. Of course, she returned to Mainframe as a Web Creature was attacking the System and worked with Arcanine and Houndoom. She was often accused as a Web Creature as she had fangs, even though she wasn't. She then worked very closely with Dot as Mainframe was without its Guardian, while Enzo was Bob's replacement. She never got into any Games as her icon was so much different, as was AndrAIa's, thus stopping her go into them, till the latter's experiment was successful. She even set up the Firewall encasing Mgeabyte and Hexadecimal, till the System was defenseless as Enzo lost a Game.
She was seen again kissing Bob, though she was responsible for erasing the System's address and setting up the traps in the Web. She made a pep talk to Dot and convinced her to fall for Bob, while she falls for Ray.
She still stayed in Mainframe during the Net War, and she was desperate saving him as she heard from Turbo he's infected and awaiting her. She and Matrix went to the Super Computer, then got infected. She hacked into Dot's firewalls then got confronted by Yoshi! She was knocked out by him, then woke up as the infected counted down to total defragmentation! Akari scolded everyone after Hex's sacrifice, and it's possible she reunited with Ray and both survived Gnosis' invasion.