One of the main themes is sacrifice. Many characters in the 'Attack on Titan light novels' have to make difficult choices that often involve sacrificing themselves or others for the greater good. There's also the theme of hope. Despite the seemingly hopeless situation against the Titans, the characters still hold on to hope and keep fighting. The theme of power and its abuse is also present, as seen in how different groups in the story use their power over others.
Sure. 'Before the Fall' is a great one. It gives a lot of background on the world of Attack on Titan, like the origin of the Omni - directional Mobility Gear. Another interesting one is 'Lost Girls'.
One of the main themes is survival. The characters are constantly fighting for their lives against the Titans. Another theme is the exploration of human nature. We see different characters react in various ways to the extreme situations they're in, some with courage and others with cowardice.
No. The 'Attack on Titan' series has a set of official storylines, characters, and themes which are mainly centered around the fight against Titans, the mystery of the world, and the complex relationships among the characters. 'Attack on titan fart fanfic' is likely a fan - created and very non - traditional take that has no official standing in the series.
No, it's not possible in the literal sense. Attack on Titan is a fictional story, not a sentient being with the ability to read or watch fan - created content. Fanfics exist in our world for fans to explore different ideas about the Attack on Titan universe.
Well, it's a really strange concept as Attack on Titan is a fictional entity and can't actually 'watch' a fanfic. But if we were to be creative, maybe it would be like the characters in the series are observing an alternate version of their own story. They might be shocked, amused or even inspired by the different plotlines and characterizations in the fanfic.