Well, if Levi turns into a girl in the fanfiction, his fashion sense could be an interesting aspect. Maybe he would start wearing different types of gear. Instead of his usual plain style, he could end up with something more stylish yet practical. Also, his interactions with female characters would take on a whole new dimension. He might be able to better understand the struggles that female soldiers face in the Survey Corps. This could lead to him advocating for more equality within the military ranks.
In the 'Attack on Titan' series, there is no clearly defined canon romantic interest for Levi. His character is mainly focused on his role as a soldier and his fight against the Titans. However, many fans like to ship him with various characters in fan - made love stories.
His role in the Survey Corps might change in terms of the tasks he's assigned. He could be used more for intelligence - gathering missions that require a different kind of approach. Since he's now a girl, he might be able to infiltrate certain areas more easily where male soldiers would draw too much attention.
There's also 'Levi's Redemption'. This fanfic focuses on Levi's past traumas and how he overcomes them. The author does an amazing job of portraying his complex personality and his relationships with other characters in a very believable way. It's a must - read for any Levi fan.
In a Levi love story within Attack on Titan, Levi is often seen as a complex and stoic character. His love, if there was one, would be filled with his typical no - nonsense attitude. He might show his love through protecting someone in his own gruff way, like how he protects his comrades in the Survey Corps.
A great 'Attack on Titan Levi Fanfic' usually has a deep understanding of Levi's character. For example, it should capture his stoicism, his loyalty, and his no - nonsense attitude. If it can show his growth or how he deals with his past, that's even better.