One interesting Neuvillette fanfic could be 'Neuvillette's Journey of Discovery'. It might explore his character in-depth, his thoughts and how he copes with the various situations in the world he inhabits. Another could be 'Neuvillette and the Mysterious Case' which could involve him solving some sort of enigma in Fontaine.
You can start by looking on Archive of Our Own (AO3). It has a large collection of fanfics from various fandoms, including those about Neuvillette. Many talented writers post their works there.
It depends on your preferences. Some might like a comic for its unique style and story, while others might prefer x comic for its specific themes or characters.
It depends on your perspective. X has moments of kindness and goodness, but he also makes mistakes like any character. So, it's a bit complicated to say he's purely a good boy.
Well, Mutant X comic has its pros and cons. On one hand, the art can be quite impressive and the action scenes are exciting. But on the other hand, the plot might get a bit convoluted at times.