The viruses are the main enemies fought in the game BOTS!!.
Most viruses appear in more than one level, and have different colors. For example, the "Klez" is actually 2 types of virus. Viruses can also have inverted colors in the "elite" levels. There, they can block attacks and their attacks do more damage. Their names also change in "elite" levels.
This is an image of an elite virus. The origonal name for the virus is Scalper. You may see this virus info soon in the "Viruses" section. This virus is a Lylin.