The old story can give characters a sense of purpose. For instance, if their ancestors had a role in the old story, they might feel compelled to continue that legacy.
No. Fanfiction is created by fans independently. Characters in the original Attack on Titan have no direct influence on the fan - made stories. However, their actions and personalities in the original work inspire the fanfiction writers.
The main difference is the 'lemon' aspect. In regular 'attack on titan' fanfic, it usually focuses on the adventure, the fight against the titans, and the general plot development. But 'attack on titan lemon fanfic' often includes some romantic or more intimate relationships between the characters, which might not be the main focus in the normal ones.
There's a chance it could be different. The anime might want to surprise the audience or adapt the ending to better suit the medium of animation. But we'll have to wait and see.
Since it's based on 'Attack on Titan', it might include Eren Yeager. He's a central character in the franchise known for his determination to fight Titans. There could also be Mikasa Ackerman, who is extremely skilled and protective of Eren.
The characters could start off as strangers and then gradually form alliances. For instance, Mikasa from Attack on Titan might be initially suspicious of the characters from Lunar Chronicles, but as they face a common threat, like a group of Titans or a powerful enemy from Lunar Chronicles' world, they start to work together. They could learn from each other's skills. Mikasa could show them her amazing combat skills with the blades, and the Lunar Chronicles characters could introduce her to their unique forms of technology or magic.
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.