Ghosts are very typical villains. They can haunt places and people, often with a tragic backstory that fuels their malevolence. Another is the serial killer. These are human villains but are extremely terrifying as they prey on the innocent. They usually have some sort of twisted motive or pattern.
The typical villains are the hillbillies themselves. They are often portrayed as inbred, uncivilized, and having a warped sense of morality. They might hunt humans for sport or have some dark, cult - like practices.
Typical villains could be those with a fetish for large bodies. They might stalk the ssbbw characters with the intention of fulfilling their sick desires. For example, a deranged collector who wants to add the ssbbw to his collection of 'unusual' specimens.
Often it's the camp counselor. They seem normal at first but then turn out to be a psycho. They have easy access to the campers and can use their position of authority to carry out their evil deeds.
It could be the classic villains from the original series like All For One. He might be interested in baby Deku's potential quirk. Another could be Shigaraki, who might see baby Deku as either a threat or an opportunity to disrupt the hero world in a new way.
There's a group of villains in the 'Villains Rising Light Novel'. One of the main ones is a woman named Lilith. She is cunning and uses her intelligence to outwit her enemies. Another is a hulking brute named Brutus who uses his physical strength to cause chaos. They all have different motives for their villainy which makes for an interesting dynamic.
I'm not sure specifically as I haven't read the exact novel. But usually, the main villains are those who oppose the protagonist the most. They are often the ones causing the most chaos and problems in the story world.
Salem is also a very popular villain in RWBY fanfiction. Given her status as the main overarching villain in the series, fanfic writers like to expand on her backstory, her motives, and her long - term plans. There could be fanfictions that focus on her interactions with other villains in a more detailed way.
Definitely 'A Nightmare on Elm Street' with Freddy Krueger. His burned face, his glove with razors, and his ability to enter dreams and kill made him a very memorable villain. Another is 'Halloween' where Michael Myers is just a silent, unstoppable force of evil. He has no real motivation other than to kill, which is super creepy.
In 'The Lord of the Rings', Frodo is a hero. He undertakes the dangerous journey to destroy the One Ring. Sauron is the main villain, with his desire for domination. Another example is in 'Harry Potter'. Harry is the hero, facing the evil Voldemort. Voldemort is a classic villain, with his pure - blood supremacy ideology and his numerous dark deeds.