Well, sort of. The movie doesn't really have a traditional 'pitch black love story' but there are some dark and intense emotional connections between the characters. They are all so different and they have to learn to work together. This process involves a lot of friction and then gradually some form of deep bond, which can be seen as a deviation from the normal love story concept and has some 'pitch black' aspects to it.
Jack Frost is a very popular choice. His mysterious past and his cool powers make him an interesting character to explore. You can dig into his feelings of isolation before becoming a Guardian and how he's changed since then.
One idea could be exploring Jack Frost's past before he became a Guardian. Maybe he had a family or a life that he doesn't remember. Another idea is to create a new villain that challenges the Guardians in a different way than Pitch. For example, a villain who can manipulate time and mess with the memories of the children the Guardians protect.
One possible plot could be that your original character (OC) is a new spirit of creativity. The Guardians initially don't trust this new spirit as they are cautious of any disruptions to the balance they maintain. But as time goes on, they realize that the OC's unique power of creativity is exactly what is needed to combat a new threat that is draining the world of its color and imagination. Through a series of adventures, the OC earns the respect and friendship of the Guardians.
One common theme is the exploration of different worlds. Since it's a crossover, the guardians often end up in new and strange realms that are a blend of the 'Rise of the Guardians' world and other Tumblr - inspired universes.
One popular 'rise of the guardians tumblr crossover fanfic' is 'Guardians in a New Realm'. It combines the characters from 'Rise of the Guardians' with elements from other fantasy worlds in a really interesting way.
The idea of good vs. evil is present in both. In Rise of the Guardians, it's the Guardians against Pitch Black. In Frozen, it's Elsa against her own fears which can be seen as an internal evil. In fanfiction, the Guardians could help Elsa face her fears. Jack Frost could use his carefree nature to show Elsa that she doesn't need to be so afraid. And the Frozen characters could help the Guardians in their fight against Pitch by bringing their own unique skills and determination.
Some fanfictions might take a different turn and introduce new threats to the guardians. Picture a story where a powerful dark force from another dimension comes to their world. The guardians then have to find new powers within themselves and work together in ways they haven't before to defeat this new enemy.
Well, I'm not sure if there are specific 'rise of the guardians bunnymund lemon fanfic' that are super well - known across the board. But you could start by looking on some of the larger fanfic platforms. Check out the reviews and ratings. Maybe there's one where Bunnymund has an epic adventure intertwined with a romantic subplot. You know, like he's on a mission to save the world and along the way he discovers new feelings. It could be a really engaging read if you find the right one.
First, think about their origin. For example, if they are a spirit of the forest, consider how they came to be. Were they born from the first tree in a magical forest? Then, give them unique powers related to their origin, like the ability to communicate with all forest creatures. Also, give them flaws. Maybe they are too trusting of strangers, which could get them into trouble. And don't forget about their appearance. If they are a spirit of the forest, they might have leaves in their hair and a bark - like texture to their skin.