To blend the two universes' rules, we could start with the idea that the Forerunners were actually an ancient civilization that had a connection to magic long ago. So their technology is based on a forgotten form of magic. Sunset Shimmer could be the key to unlocking this forgotten knowledge. In terms of combat, the shields in Halo could be seen as a form of magical protection similar to the spells Sunset can cast. And the way the Spartans move and fight could be enhanced by Sunset's knowledge of movement spells.
One way is through a crossover event. Maybe a portal opens up between the two universes. Characters from each side then enter the other's world and have to deal with the new environment and threats. For example, the RWBY team could find themselves on a Halo ring and have to fight the Covenant alongside the Spirit of Fire crew.
One interesting plot could be Sunset Shimmer getting transported into the Halo universe. She might use her magic skills to help the UNSC in unexpected ways, like creating magical barriers to protect against Covenant attacks. Another plot could involve a Halo character coming to Sunset's world and having to adapt to the magic there.
In 'Sunset Shimmer Abused Fanfiction', it often has a different character arc for her. Instead of the typical growth in power or friendship like in other fanfictions, here she has to deal with the trauma of abuse. This leads to a different set of challenges and development for her character. Also, the plot usually revolves around the abuse and its consequences, which is quite distinct from fanfictions that center around other aspects such as her magical abilities or school life.
One great Sunset Shimmer and Twilight Sparkle fanfiction is 'The Bond Beyond Magic'. It delves into their relationship as they face a new magical threat together. The story is really engaging as it shows how they combine their unique magical skills to overcome difficulties.
They might interact in a way where Naruto sees Sunset as someone in need of protection at first. But Sunset would quickly prove that she can hold her own. They could end up in a situation where they have to rely on each other's skills. For example, Naruto's speed and strength combined with Sunset's magic could be used to defeat a powerful enemy. They would also share their dreams and goals, Naruto about becoming Hokage and Sunset about achieving something great in her own world or in the Naruto world if she decides to stay.
One great 'Twilight x Sunset Shimmer' fanfiction is 'A New Beginning'. It beautifully explores their relationship as they face challenges together in a new magical realm. The author does an amazing job of developing their characters and the plot keeps you hooked from start to finish.
Another common theme is self - discovery. Both characters are often on a journey to learn more about themselves, their powers, and their place in the magical world. For example, in some fanfictions, Sunset Shimmer has to come to terms with her past actions and find a new path forward with Twilight's help.
A third idea is that the male OC is from a different dimension. He accidentally lands in Equestria and meets Sunset Shimmer. At first, Sunset is suspicious of him but realizes he's lost and in need of help. They embark on a journey to find a way to send him back home. Along the way, they encounter various obstacles and have to rely on each other's strengths. This adventure brings them closer together, and by the time they find a way for him to return, they have developed deep feelings for each other.
In fanfiction, Sunset Shimmer and Lemon could be part of a whole new story arc that doesn't follow the main plot of My Little Pony. Maybe they are involved in a mystery that only they can solve. It could involve something like a disappearing magic spell or a strange occurrence in their school. Their interaction in these fan - created scenarios can be really exciting for readers who are looking for something different from the original series.
A common theme is redemption. Since Sunset had a bit of a dark past in the MLP universe, many fanfictions focus on her journey to make up for her wrongdoings and become a better person, or pony in some cases.