Well, the theme of redemption can be quite common. For example, in cases where a character was once a tool for the possessing evil force but then tries to break free and redeem themselves. In 'Inuyasha', some characters who were influenced by the dark powers try to find a way back to the light. Another theme is the exploration of human nature. Possession often reveals different aspects of human nature, whether it's the will to survive against a possessing entity as in 'Tokyo Ghoul' or the capacity for change when dealing with an inner possession like in 'Soul Eater'. And then there's the theme of friendship and support. Friends often play a crucial role in helping the possessed character, like in 'Naruto' where his friends support him in dealing with the Nine - Tails.
The theme of isolation can be very common too. When a person is possessed, they are often ostracized or separated from others. Their family and friends may be afraid of them or not know how to deal with the situation. This isolation can add to the horror and desperation in the story. Also, the idea of a violation is present. Possession is like an unwanted intrusion into a person's body and mind, which is a very disturbing concept that runs through many possession stories.
Another theme could be redemption. The possessed character may have made some mistakes in the past, and the possession becomes a form of punishment or a test. Through the process of dealing with the possession, they find a way to atone for their sins and become a better person. For instance, in a story where a person is possessed by a spirit that represents their guilt, they gradually face their past and make amends.
One common theme is the loss of self - identity. As the slime possesses the girl, she gradually loses who she is. Another theme is the struggle between the girl and the slime for control of her body and mind. Also, there's often a sense of the unknown and the creepy, as slime is an unusual and somewhat icky thing to be possessed by.
Love and jealousy are common themes. The strong love between gay male characters can sometimes lead to jealousy, which is related to possession. For example, if one character feels that his partner is giving too much attention to someone else, he may feel jealous and act possessively.
Another theme is the struggle between good and evil. The possession represents the intrusion of evil, and there is often a fight, either within the mother's mind or by the family members, to expel the evil force and restore the mother to her normal self. This can involve elements of sacrifice, love, and determination. For example, a daughter might have to face her greatest fears to save her possessed mother. In some stories, the theme of the unknown and the fear of the supernatural is also prominent. The idea that something can take over a person's body without warning is a terrifying concept that is often exploited in these stories.
Some common themes in anime stories include friendship. Many animes like 'Naruto' show the strong bond between friends that can overcome great difficulties.
This kind of topic involves adult and inappropriate content, so I can't provide relevant answers.
One common theme is the battle between the possessor and the possessed's will. For example, in many stories, the person whose body is being possessed tries hard to resist the intruder. Another theme is the mystery of how the possession occurs, whether it's through magic spells, cursed objects or some other supernatural means. Also, the idea of redemption or liberation from the possession is often seen, like when a character is finally freed from the unwanted entity in their body.
The theme of community can also be present. For instance, in the school yearbook story, the possession is important for the whole school community. It binds the past and present members of the community together, and everyone can have a sense of belonging when they look at or talk about this possession.
Isolation can also be a theme. When a character is possessed, they are often isolated from their normal life and relationships. In 'Carrie' by Stephen King, Carrie is isolated because of her powers which seem to possess her in a way. Her powers set her apart from others and cause her to be alone in a non - erotic sense of possession.