So this is a villain I am having trouble with. I have my evil overlord from the third installment in the series and I am happy with him, he has a fleshed out background and is three dimensional evil a very old man who is defeated at the end of the story. In my fourth one I started introducing new villains. There is a villain who has the power of telekinses who is also a criminal working for the enemy company, I am fairly happy with him since afterall he is mostly a device to alert the main character of the presence of an enemy gang forming against him. In the fifth story they hire a demon who was known as a famous serial killer, he lives in underground caves and enjoys torturing people. He was once defeated by a team of heroes years back but the current gang raise him from the dead to keep him on their side as an asset. Long story short one of my female characters' friend's is kidnapped by the demon (I just called him Burgon Devil for now, a play on the Jersey Devil name) and she goes to find her. She winds up kidnapped too and of course the main character has to eventually go to this cave. I am having problems with him though. He is a 7ft tall demon who doesn't speak or anything he just shows up around people's houses and his face appears on walls. Do I need a backstory for him? Do I need to make him interesting? I think my other villains have fleshed out backgrounds and personalites is it okay for me to have one villain be just a demon, just pure evil. Afterall, he was born on a planet where that kind of behaviour is normal, so he doesn't know anything different and he isn't like the others who grew into their role. One of the main things is that instead of a mental battle (like some of the others before) he offers more of a physical battle, so knowing that is it still important to flesh him out. Thanks!