The main character is, of course, the odd clumsy girl. We don't know much about her from just the title, but she's likely to be a relatable character who experiences the normal ups and downs of life in a rather clumsy and odd way.
One interesting aspect could be the character development of the clumsy girl. She might start off as someone who is constantly getting into comical mishaps but gradually learns and grows. For example, she could be clumsy in social situations at first, like tripping over her words or accidentally bumping into people at parties, but over time she becomes more confident and poised.
One interesting 'odd girl out fanfic' could be about a girl who has unique magical powers in a world where everyone else has more common abilities. She stands out and has to navigate through the challenges of being different while also trying to find her place in the magical community.
In some 'Odd is a Girl' fanfictions, the author might explore how Odd, as a girl, would fit into the existing storylines of the original work. Maybe she has to deal with different challenges or expectations that come with being a female in that particular fictional universe. This can lead to some really creative plot twists and new relationships with other characters.
One popular 'the odd girl out fanfiction' is 'The New Beginning' which explores the character's journey in a new school setting. It adds interesting twists to the original plot.
It could also be Vicky, Timmy's babysitter. It would be a funny twist as she's usually the one causing trouble for others. If she got a wedgie, she would be in an extremely embarrassing situation, and it would be interesting to see how she would react and how the other characters would respond to seeing her in such a state.
I'm not sure exactly without reading it, but likely there is the titular odd girl out. There may also be characters who either shun her or try to befriend her.
One of the main themes could be isolation. The 'odd girl out' often feels alone and different from those around her. It might also touch on the theme of identity, as she struggles to find where she fits in.