Daemon is a Super Virus who infected the Super Computer and turned it into her domain. She had complete control over the entire force of the Guardians, except for Bob, Matrix and Little Enzo. Her outward appearance is of a cute and beautiful young girl with a thin crown. She has none of the traditional claws and spikes like other viruses, and she's also smaller in body size than other viruses, looking more like a Sprite.
Daemon is a Cron Virus, and like any virus, aims to spread her infection. Her function is to bring unity to the entire Net. To do this, she will infect everyone and everything in the Net before her timer reaches zero, at which point she announces the word - "Cron" - and cause every Sprite and Binome to count down to their self-destruction. Thus, the Net would be unified in the peace of total oblivion.
Despite her enormous power, Daemon did have limits. She was incapable of forming portals on her own, causing her to rely on the Guardians. Daemon also could not infect Key Tools, only the Guardians they belonged to. Unlike some other Super Viruses, she could not destroy densely coded firewalls on her own. At first, Daemon relied on conquering the Net's pathways and major hubs to control the Net, until she was ready to spread her infection.
When she first infected the Super Computer, Daemon's orders to the Guardians were to restrict all Net travel and force Systems to remain connected to the Net, ensuring there would be no escape from her infection by "locking the door open". Some Systems were forced to build massive prisons to hold anyone that violated this new law, such as the Desert Port System. She set the new Guardian protocol as 'Divide and Render'.
Now that she controlled the largest power base in the Net, Daemon set up her headquarters in the Super Computer's Master Clock. She created a throne room for herself in the Clock Speed Room, with several honor guards and a massive viewscreen to keep track of the Guardians' efforts to spread her infection. From here, she could effectively control the entire Net by just controlling those pathways, and if any system ever resisted the word, Daemon would simply move into squash it.
Most of the Guardians were completely under her control, but the ones with more complex codes, like the Prime Guardian Turbo, were able to fight her infection for a time. Turbo had the visible signs of Daemon's infection but was able to fight its control and work with others, like Matrix, to resist her laws. Unfortunately, the infection continued to grow in Turbo and eventually took over his self-control. The growing infection caused Key Tools to leave the Guardians. The small devices must have realized she needed their portal forming abilities and fled to another level of Cyber Space.
The ReBoot Multiuniverse[]
She was first described by Turbo to Matrix at the Desert Port System's saloon along with Marill. He informed the renegade she's infected the entire Guardian collective excepting Matrix and Bob, which was someone she longed for. She also infected the Web Creatures making them very hostile, unlike a few docile others trapped in Zebes. By the time Bob reunited, he and Matrix were determined to face her after Megabyte.
In the Net War, she ordered the collective to invade Mainframe and the Control Tower to have it vulnerable to doors and her Zoom Room. She took control over the Super Computer, even the Prime Guardians Turbo and Daecon. She also captured Mike, AndrAIa, Matrix and Mouse before she sailed to Mainframe; she knew the only way to access it was to use the gifted hacker's abilities. Once she infected all of Mainframe, excepting Young Enzo, Frisket, Hack and Slash, Fox and Link Jr protected by a Game Cube, Samus intervened and challenged her to a tourney! As the Smashers advanced, she still cheated as she ordered Bob to turn a Tear to the Smash System awaiting infection! Mewtwo tried to stall her, though after Bob's defeat, Samus and the Pokémon challenged her to a final match at Final Destination. She was about to infect Master Hand, though he was transformed to a trophy by Samus. The duo was successful as she was weak enough to be turned into a trophy, before Samus obliterated her!
Still her infection grew, shutting down the Falcon Flyer! Fortunately, the survivors were spared before they counted down to 0, as the Cron virus resulting in total defragmentation! Hexadecimal was able to spread the cure as she was deleted!