You know after reading through this thread, whoever made the backstory to this guy thought it out decently enough. Gray is the medium between the shades Black and White, and midway usually stands for neutrality. Therefore by being a neutral character himself he opposes both protagonists, the PC, Looker, Interpol, and antagonists alike.
Also, Team Clear could also represent neutrality, for a translucent or transparent object generally represents the absence of a defining color scheme.
All in all, the concept of having a "Gray-Area neutral grounded badass" opposing evil teams and the police who view them as terrorists is very appealing.