Appearance of the protagonist:
Will this story have a romance? The quick answer is yes. But not until the MC is 18. So, I only have two options.
Paige Swanson (Young Sheldon)
Leslie Burke (Bridge to Terabithia)
Personally, I prefer the first option. It would be interesting because we don't know much more about Paige. That's why we can innovate a lot.
As for whether you find any similarities with other Sheldon fanfictions, I must say I took their ideas and adapted them to this novel, which I abandoned last year. I hope you like it.