I think they should really have a Code Lyoko videogame for Nintendo GameCube and for other systems as well considering the fact that the show itself is sort of like a videogame already in the virtualized world.
If they were to come out with a Code Lyoko videogame, I would predict it would be titled something like 'Code Lyoko: Transfer, Scanner, Virtualization!!!' What titles would you come up with? Also, why doesn't Sissy ever get virtualized? But if she were to be virtualized, what do you think her new appearance would be and what powers do you think she would have?