Often, there's the theme of redemption or the opposite, the fall into darkness. The character of Dio is quite complex in the original story, and his sister might be used as a tool to either continue his evil legacy or break away from it. There may also be themes of love and friendship, as the oc (original character) might form new relationships in the Jojo world.
One common theme is power struggle. Since Dio is a very powerful character in the Jojo universe, when there's a female version or a female related to Dio, she often has to deal with the power dynamics. For example, she might be trying to gain power like Dio or struggling against his overpowering influence.
There are often fan communities on platforms like Reddit or Tumblr that discuss 'oc jojo dio sister fanfic'. You could join those groups and ask for recommendations. Maybe someone has already compiled a list of great fanfics in this category. Another option is to check out dedicated Jojo fanfic forums where fans share and review different stories.
One common theme is the struggle for power. The male OCs often have to deal with their newfound Stand powers and learn how to control them, just like the main Jojo characters. For example, in many fanfictions, the OC has to overcome challenges related to their Stand's unique abilities.
It could be that it's about Dio from Jojo's Bizarre Adventure reading a story. Maybe it's a fan - created scenario where Dio's character is given the act of reading a story, which could be used to show a different, more 'human' side of him, or it could be part of a strange, dream - like sequence in a fanfic or fan art.
One common theme is family. Since it's about a sister relationship, the stories often explore the love, loyalty, and sometimes the conflicts within the family unit. Another theme is power. With Wanda having such strong powers, the fanfics usually involve how the OC sister's power relates to Wanda's, whether they work together or face challenges due to differences in their powers.
Often, family bonds are a common theme. Since it's about sisters in the Yakumi OC context, exploring their relationship, whether it's a loving, supportive one or a more complex and evolving bond. Another theme could be growth. The sisters might experience personal growth throughout the story, learning from each other and their experiences.
One common theme could be a power - dynamic exploration. Given Dio's over - powering nature in Jojo and Sakuya's abilities in Touhou, how they interact in terms of power is interesting.
One common theme is family. Since the OC is a sister, there's often a focus on family dynamics, like loyalty and protection. Another theme is fitting in. The sister OC has to find her place in the Chicago PD environment which can be tough.
Adventure is also a popular theme. The fanfics might send Spencer's sister on wild adventures with the original characters, whether it's solving a mystery like in the Psych show or having some other kind of escapade. It adds an element of excitement and new storylines to the existing Psych world.
Family loyalty is a common theme. The OC sister often has to balance her loyalty to her family with her duties in the Chicago PD. Another theme is self - discovery. As she faces various challenges in the PD, she discovers more about herself.