One interesting plot point could be how Salem's time travel affects the balance of power in the RWBY world. For example, if she goes back in time and allies with certain villains or undermines the heroes in their early days.
One popular 'Salem Time Travel RWBY Fanfic' could be 'Time Warped: Salem's Journey'. It offers a unique take on Salem traveling through time and how it affects the RWBY universe. The story often delves into the complex character of Salem and her relationships with other characters in new and interesting ways.
One idea could be Salem's reaction to the powers and technology in the Worm universe. Maybe she tries to use some of the parahuman abilities or advanced tech to further her own goals in the RWBY world.
A good RWBY Salem fanfic often has a deep exploration of her character. It should show more than just the 'evil villain' side. For example, it could explore her past traumas or her reasons for her actions. This makes her more three - dimensional.
One common theme is redemption. Since Salem is often portrayed as a villain, many fanfics explore the idea of her seeking redemption as a human. For example, she might try to make up for her past wrongs.
A simple way could be through a dimensional rift. A character from RWBY accidentally stumbles into the Worm universe or vice versa. Then they have to figure out how to get back while dealing with each other's worlds' problems.
The 'rwby time travel semblance oc fanfic' might explore the concept of how the OC's time - traveling semblance affects their personality and relationships. If they constantly jump through time, they could become detached from the present, or they might form strong bonds with characters from different time periods. They could also learn valuable lessons from the past that help them in their present - day battles or quests in the RWBY world.
I really like 'Ruby's Time - Travel Adventure'. In this fanfic, Ruby travels back to the early days of Beacon Academy. It's full of heartwarming moments as she interacts with her younger self and her friends in a new way. The story also has some cool action scenes that are well - written.
A lesser - known but really engaging 'human Salem RWBY fanfic' is 'When Salem was Human'. This fanfic imagines Salem's life before she became the powerful and feared figure. It details her early days, her hopes and dreams, and how she might have been corrupted over time.
Ruby would be really interesting. Since she's the main character, seeing her go back in time and interact with her younger self or her mother could be really emotional and full of character development. She could also use her knowledge to make herself an even better Huntress at an earlier age.