How many forms do ghosts come in?

There are a couple different forms they come in as. They come as human, or benign and poltergeist; and the inhuman ones, which are demons. Demons are the ones you should watch out for and avoid because these spirits can do a demonic possession, they can physically assault and harm you, they can turn family and friends against one another, and other negative things. Benign spirits are okay and they don't need to be pushed out of the place of residence, while poltergeists are a bit of a nuisance.