The main character would obviously be the shy girl herself. Maybe there could also be her best friend who is the first to notice the strange butt expansion and tries to support her through it.
Well, it could be about a shy girl who discovers she has a unique ability that causes her butt to expand in certain situations, like when she's extremely nervous or excited. And then she has to deal with the comical and sometimes embarrassing consequences of this strange phenomenon.
Luigi could be an important character. He might notice the shy girl before Mario does and tries to encourage her to talk to Mario. Or, Toad could be there as a friendly sidekick, helping the shy girl get used to the new environment in the Mushroom Kingdom. He could also give her tips on how to overcome her shyness based on his own experiences.
Since I don't know the exact 'blueberry girl expansion story', it's hard to say for sure. But most likely, the blueberry girl herself would be a main character. There might also be characters like her family members, if the story is about her family life and how blueberries are part of it. Or perhaps there are friends she has who are involved in her blueberry - related adventures.
Since I don't know the exact 'bunny girl expansion story', I can't say for sure who the main characters are. But likely, the bunny girl herself would be a main character. There might also be other characters like friends or foes she encounters in her story.
Suga could also be the main character as the doctor. Given his cool and sometimes aloof exterior, it would be interesting to see him interact with a shy girl. The girl could be a volunteer who is afraid to speak up. Suga's blunt but kind nature would eventually help the girl gain the courage to express herself more freely as he gets to know her better.
May could also be the Pokemon girl in this story. She might be exploring a new region and come across a local specialty that she can't resist. The food is so delicious that she keeps eating, and soon her belly begins to expand. She then has to use her Pokemon knowledge and skills to find a way to get back to normal.
Well, if 'gay butt expansion story' is some kind of fictional or creative story, it might be related to themes in gay literature or art that are exploring body - positive or perhaps some sort of transformation - related ideas in a very unique and perhaps humorous or thought - provoking way. But again, this is all speculation without more details.
The main character is the camera - shy worm, of course. Another important character could be a friendly sparrow who befriends the worm. The sparrow doesn't understand why the worm is so afraid of cameras at first, but as they become closer, the sparrow tries to help the worm face its fear. There might also be a grumpy mole who accidentally digs up the worm's hiding places from the cameras.
Well, a butt expansion MLP fanfic could be a fanfiction where the writer has come up with a really unusual plot. Maybe it's some kind of magical or strange event that causes the butts of the MLP characters to expand in the story. But it's not a very common or mainstream type of fanfic idea within the MLP community. It might be more of a niche or even a joke concept that someone thought up.
Since I'm not familiar with the story, I can only assume. There might be a protagonist, perhaps a journalist or a historian, who comes to Shy Grove to investigate the strange occurrences. And there could be a local resident who has had personal encounters with the ghost and helps the protagonist in their investigation.