Virus can actually exist without Fresh possessing Error- and the other two can exist while being him! Because Error is such a glitchy, unstable being, when Fresh possessed him and used his body as a host it didn't exactly.. work. It worked as normal, creating a new body with new powers for Fresh, but instead of the normal action where it would create a new body with only Fresh's consciousness/thoughts/lack of feelings/etc, it instead merged the two, having both of them in control at once, almost like a fusion. It was also noticed that upon this fusion feeling any strong emotion it would glitch out and almost separate itself, with Error and Fresh being visible for split seconds at a time. Whenever Fresh chose to leave Error's body, the two would return as normal, but Virus could exist as well. He would exist as an incredibly glitched out being that could disappear from reality itself at a moments notice, or he could exist as his own entity with his own thoughts, feelings, etc for weeks at a time. He casually hangs out in the anti-void whenever he is able to exist as himself, and goes by the name Virus.