In Islam ghosts also don't exist, but jinn do, and jinn can take the form of person, although that's not a common thing, but thinking about the paranormal is not encouraged because there's nothing explicit written about it, if you're "haunted" it could be because of someone doing black magic to hurt you, and to protect ourselves from such things we should always read Quran and do thikr/dua (like prayer, but not like the 5 prayer, it's asking God to protect you kind of prayer). But generally it's adviced not indulge into these topics, and in most cases if you feel something supernatural happening, it's most likely something with a physical explanation.
and of course as a Fujoshi. This is so lit. The goo/slime part was a bit ridiculous but okay. Just a quick FYI, and I'll be happy if you also share beliefs in your culture/religion, In catholicism we don't believe in ghosts of dead loved ones coming to haunt or whatever, but we believe in souls living somewhere once they leave the body (purgatory), any haunting or ghost apparitions or what not are believed to be either energy remnants or demonic. So, calling out to dead loved ones to haunt you or anything like that is forbidden.