Computress is Dexter's sentient cybernetic assistant that manages the running of DexLabs. In the original Cartoon Network series Dexter's Laboratory, Dexter referred to his feminine, but non-ambulatory computer as "Computer"; "Computress" was a robot described as "Mandark's brother" that teamed up with Dexter to "get" Mandark and Dee Dee. In some way or another, "Computer" and "Computress" ended up conflated together as a mobile computer.
"Computer" was redesigned and upgraded to be made into "Computress." She is Dexter's personal assistant and works with players in FusionFall Legacy by giving them missions to complete. Her role in the game is in the Future, in which she sends players to collect tools for the time machine to go to the Past. In the original game, she had a Fusion, but didn't have a Nano. In FusionFall Legacy, since nearly every major character will have a Nano, Computress presumably will, too, though its precise form has not been confirmed yet.