Another theme might be the reactions of other characters. When bunnymund is hurt, how do his friends or comrades respond? Do they come to his aid? Do they seek revenge on whoever hurt him? There could be a lot of character - development - centric stories around this in 'bunnymund hurt fanfiction'.
One common theme could be recovery. After getting hurt, the story might focus on bunnymund's journey to heal, both physically and emotionally.
Often, there are themes related to sacrifice. Bunnymund might get hurt while trying to protect someone or something important. And also, the theme of isolation can be present, where his being hurt leads to him being alone and having to deal with the pain on his own.
One common theme is discovery. Often, the OC is new to the world of Bunnymund and has to discover how things work, like the magic and the rules of the Easter realm. For example, in many stories, the OC will be amazed at how Bunnymund can manipulate time and space for Easter egg hunts.
The theme of protecting each other also pops up a lot. Given their roles as Guardians, they are both in the business of protecting things (Tooth - teeth, Bunnymund - eggs). Fanfictions often show them protecting each other not just from physical threats, but also from emotional harm, which is a really sweet and endearing aspect of these stories.
I'm not an expert on this, but often there could be themes related to the challenges of the unexpected pregnancy, like how the character deals with the physical and emotional changes. Another theme might be the reactions of the other characters in the story towards the mpreg situation.
Searching for 'bunnymund hurt fanfiction' requires some exploration. You can start by using different search engines and being as specific as possible in your search. Also, consider reaching out to other fans who are into the same character. You could post in relevant forums asking if anyone knows of any good 'bunnymund hurt fanfiction'. Another option is to look at the profiles of authors who write fanfiction for related characters or universes. They might have also written something related to bunnymund getting hurt.
One common theme could be the exploration of their different personalities. Jack Frost is often seen as more carefree and mischievous, while Bunnymund is more grounded. Their relationship in the fanfiction might play on how they balance each other out.
Another theme is the balance of nature. Since they are associated with different seasons, many fanfics explore how their relationship affects the natural order. For example, they might have to work together to ensure that winter doesn't overstay and disrupt the coming of spring.
A common theme is the interaction between Bunnymund and humans. It often shows how he copes with human emotions and behaviors that are so different from his own world.
One common theme could be emotional pain. Maybe Arthur has been betrayed by someone close to him, and the fanfiction explores his journey of dealing with that hurt. For example, if a friend he trusted turned out to be a traitor.
One common theme is isolation. Magnus might be isolated due to his unique powers or past traumas, which causes him pain. For example, in some fics, his immortality makes him feel alone.