Ymir's character could be developed by exploring her past more deeply. For example, her time as a Titan before joining the Survey Corps. This could make her more complex as she struggles with her identity. Christa, on the other hand, might develop by breaking out of her 'nice girl' persona. As she faces more challenges with Ymir by her side, she could become stronger and more assertive.
Another difference lies in the overall mood. Canon AOT has a rather dark, gritty, and often hopeless mood due to the constant threat of Titans. However, a friendly Titan fanfic would likely have a more positive, hopeful mood. It might explore themes of redemption for the Titans, or how their existence could be beneficial to the world of AOT. This is a complete departure from the doom - and - gloom feeling that often pervades the official AOT story.
One possible fanfiction could be about their adventures together within the walls. Maybe they discover a hidden passage that could potentially change the fate of the Survey Corps. They might face Titans together and in the process, their bond deepens as they rely on each other's skills and instincts.
In a fanfic, Christa and Ymir might find a hidden place within the walls. This place has secrets about the origin of the Titans. As they explore it, they learn more about each other. Christa could discover Ymir's past and understand why she is the way she is. Their story could be filled with mystery and adventure, and in the end, they become even closer friends.
In some fanfictions, the bond between Eren and Ymir is shown as a fateful one. Eren, being a key figure in the fight against Titans, is often seen as being drawn to Ymir's power and the secrets she holds. It can be a very intense connection, like an unspoken understanding that they are both part of something much larger in the Attack on Titan universe.
The AOT manga wraps up in a way that ties up most of the storylines. However, it leaves some room for interpretation and has led to different opinions among readers about the overall satisfaction of the ending.
Well, it all happened when Eren got hold of that special serum. When he used it, it activated a genetic trait within him, allowing him to transform into a Titan. It was a crucial moment in the story that changed everything for him.
One more concept could be a time - travel fanfiction. Christa and Ymir are sent back in time to a crucial moment in the history of the walls. They then have to use their knowledge of the future to try and change things for the better. Their relationship would play a key role in how they approach this new situation and the decisions they make.
It's reasonably close. AOT's anime adaptation adheres mostly to the comic, with just a few tweaks here and there that don't significantly change the main plot or character developments.
In fanfiction, the relationship between Eren and Ymir can be very complex. Some fanfictions might explore how Eren's actions are influenced by Ymir's power and history. For example, they could depict Eren as trying to understand Ymir's true intentions behind the power of the Titans. It might also show how Ymir views Eren's determination and how that might play into the overall story of the Attack on Titan universe within the fan - created narrative.