Right now, I am convinced that helloworld is bad, with some of the evidence going back to the beginning of the game, before killer was lynched. Here's my reasoning:
I decided to go look back at the first few pages of the game, and while looking, he started the "lynch killer" bandwagon. Not only this, but his reason was not told. This leads me to believe that he is mafia, and he managed to find out that killer was a cop early on, and us, not knowing what to do, just went along with it. He's also been somewhat quiet throughout this game, but not quiet enough to be "inactive." With such evidence, I feel as though he is doing things behind the scenes and is one of the zombies. And that he have mainly been playing us for this entire time.