One interesting 'Attack on Titan' crack fanfic could be one where the characters swap personalities. For example, Levi being overly clumsy and Eren being super neat. Another might be a fanfic where the Titans can talk and they form a sort of alliance with the humans against a new common enemy. There could also be a crack fanfic that puts the characters in modern - day situations, like going to a shopping mall or a concert.
Well, a great 'Attack on Titan' crack fanfic might be the one where all the Survey Corps members have to participate in a cooking competition. It's a hilarious idea as you can imagine Levi trying to cook with his strict and perfectionist attitude, and Armin being all nervous. Also, there could be a fanfic where the Titans are actually friendly and they play games with the humans. It would be really different from the serious and dark tone of the original series. And then there's the fanfic where the characters get transported into a fairytale world and they have to adapt to those rules while still having their 'Attack on Titan' traits.
The best chapter pointer here is Chapter 55, "I Can Prove Everything Miss Jiang Said Is True!". It opens with Su Yinwan hadn't expected that, in just one day, Jiang Li's reputation had... and closes on He Yun's fans were immediately displeased..
If you want the clearest chapter reference, go to Chapter 66. Early on, I can't take it anymore, why did the young master even find a pair of...; later, the chapter leans on He just knew that his eyes were swollen like a small hill and he couldn't....
If you want the clearest chapter reference, go to Chapter 72. Early on, Jiang Yan was still griping when suddenly a fair hand reached out beside...; later, the chapter leans on I'll take these, thank you." In an instant, five pairs of eyes stared over....
If you want the clearest chapter reference, go to Chapter 49. Early on, My phone!!!" Jiang Yan's roar echoed continuously through the mountains in...; later, the chapter leans on Watching helplessly as his latest-model phone was taken away by a....
The best chapter pointer here is Chapter 91, "Jiang Yan is Number One on the Trending Searches Again?!". It opens with When Jiang Li saw that he had been assigned a harrow, Qi Tianyu felt his... and closes on Hahaha, Young Master, what the heck are you thinking about eating!" "I'm....
If you want the clearest chapter reference, go to Chapter 36. Early on, But soon, people began to question the authenticity of Jiang Li's bare...; later, the chapter leans on After all, these days, faux bare-faced makeup can be indistinguishable....
If you want the clearest chapter reference, go to Chapter 31. Early on, Before Shen Lan had reached the backyard, she already heard the sounds of...; later, the chapter leans on Facing the freshly risen morning sun, she noticed at a glance the girl....
Chapter 43 is the strongest chapter-level answer because it starts from The moment He Yun willingly sat next to Jiang Li and even took off his... and follows through on Just as she turned her gaze away, the other party huffed and withdrew her....
A practical answer is Chapter 43, because it turns the idea into a concrete scene. The chapter opens with The moment He Yun willingly sat next to Jiang Li and even took off his..., adds pressure through VIP lounges and business class still count as transformation?, and ends on Just as she turned.
Look to Chapter 39 for the clearest answer. It begins with Qi Tianyu had been looking forward to watching Jiang Li's drama unfold., keeps building through But to his surprise, Wen Jiaojiao, who seemed to possess some strength,..., and lands on His original intention was just to make Jiang Li back.