One common theme is the 'unlikely friendship'. Given Chucky's nature as a horror icon, a story might revolve around the reader and Chucky forming an unexpected bond. Another theme could be 'redemption'. Maybe the reader tries to help Chucky become less of a villain.
One common theme is their twisted love. Their relationship is far from normal, and this is often explored in fanfiction. Another theme is their shared thirst for chaos and mayhem. They are both killers, and this aspect is highlighted in many stories.
Survival is also a big theme. When these two are in the same story, the characters in the fanfiction often have to figure out how to survive not just one, but two terrifying killers. This can lead to some really intense and suspenseful plotlines, as the victims have to deal with Jigsaw's mind games and Chucky's unpredictable attacks at the same time.
One common theme is the struggle between good and evil. The oc usually represents the 'good' side, trying to either stop Chucky's evil deeds or at least survive his attacks. Another theme is the unexpected relationship that forms between the two. Despite Chucky being a murderous doll, the oc often finds themselves in a complex situation where they have some sort of connection with him.
One idea could be that the reader is a detective trying to solve the mystery of Chucky's murders and ends up in a strange psychological battle with him. Another could be that the reader is a dollmaker who discovers Chucky's true nature and has to decide whether to help him or stop him. Or perhaps the reader is a psychic who can communicate with Chucky on a spiritual level and tries to exorcise his evil.
One common theme is adventure. Since Shiro is often associated with heroic deeds and battles, many fics will have the reader joining him on some kind of intergalactic adventure. Another theme is trust. As Shiro is a leader, the relationship between him and the reader might develop as they learn to trust each other in difficult situations. There's also the theme of healing. Shiro has been through a lot, and some fics will explore how the reader helps him heal from his past traumas, and vice versa.
One common theme is the relationship development between Karma and the reader. It could start from a simple acquaintance and gradually grow into a deep friendship or something more. Another theme is adventure. They might go on some exciting adventures together, facing challenges and solving problems side by side.
Another theme could be the exploration of Stein's scientific side in relation to the reader. For example, the reader might be involved in Stein's experiments in some fanfictions, leading to a deepening of their connection. Also, themes of trust and acceptance are quite common, as Stein is a complex character and the reader has to learn to accept him as he is.
There are also fanfictions that focus on the power dynamics in the relationship. Hordak is a powerful figure in the She - Ra world, and how this power affects his relationship with the reader can be an interesting theme. Some stories might explore how the reader challenges his power, while others might show how they are influenced by it. And sometimes, the theme of acceptance - of Hordak's past, his differences, etc. - by the reader is also explored.
One common theme is friendship - to - lovers. It often starts with the reader and Patton being friends and then developing deeper feelings. Another theme could be comfort. Patton is usually portrayed as a very kind and comforting character, so fanfictions might focus on him comforting the reader during a difficult time. There's also the adventure theme, where the reader and Patton go on some sort of adventure together.
One common theme is adventure. Phineas is often depicted going on wild adventures with the reader. Another theme is friendship turning into love, showing the development of their relationship.