I'm not sure specifically as there could be many short stories named 'the moustache'. It might be about a character with a moustache and the events or experiences related to him. Maybe it's about how his moustache affects his appearance, relationships or the way people perceive him.
Sadly, I have no idea which artist or writer is behind the'moustache that was evil graphic novel'. It could be a small - press publication, in which case the creator might not be widely known. It could also be part of a niche genre or a self - published work, making it even more difficult to determine the creator without further research.
Well, without having read it, it could be that the 'moustache that was evil' is a central symbol in the graphic novel. Maybe it's a magical or cursed moustache that causes chaos and harm. The graphic novel might explore how different characters interact with this evil moustache, either trying to control it, destroy it, or being influenced by it in negative ways.
I don't know the specific main characters as I haven't read the story. But it's likely that there is a character who has a moustache and perhaps people around him, like his friends, family or colleagues who are affected by or react to his moustache in some way.