The theme of redemption can also be seen in some Accelerator Last Order fanfictions. Given Accelerator's past actions, some writers explore how his relationship with Last Order can be a part of his path towards redemption. He might find new purpose in protecting her and making up for his previous misdeeds. Also, there are fanfictions that involve them facing off against new and powerful enemies together, highlighting their teamwork and the bond between them.
One common theme is protection. Accelerator is often portrayed as protecting Last Order from various threats in the fanfiction, given his powerful abilities and his connection to her.
I really like 'The Protector's Promise'. It focuses on Accelerator's unwavering commitment to keep Last Order safe. The story has some great action scenes where Accelerator shows off his amazing powers while shielding Last Order.
There are a lot of emotional arcs that can be explored in such fanfiction. Accelerator has a complex past and personality, and his bond with Last Order can be a source of healing for him. Fanfiction writers can show how he gradually opens up more because of her presence, and how Last Order, in turn, grows to understand him better on a deeper level.
One common theme is protection. Accelerator is often depicted as protecting Last Order from various threats in the fanfics. Since he has a sort of guardian - like relationship with her in the original work, this theme builds on that dynamic.
One common theme could be protection. Given Accelerator's power and his complex character, he might be seen as a protector of Last Order. Another theme could be friendship evolving into something more, as they interact more in the fanfic stories.
You can try fanfiction websites like Archive of Our Own (AO3) or FanFiction.net. AO3 has a large collection of fanfictions and a good search function to help you find Accelerator and Last Order - related fanfictions easily.
One idea could be a story where Accelerator has to protect Last Order from a new and powerful enemy. Maybe this enemy is after Last Order because of her unique abilities and Accelerator has to use all his power and strategic thinking to keep her safe.
Alternate universes are also very common. For example, what if certain events in the story had happened differently? It allows for a lot of creativity. Writers can change the relationships between characters, the power dynamics, and the overall plot in these alternate settings.
I'm not sure which specific 'last order x accelerator' fanfic to recommend offhand. You could try searching on fanfic websites like Archive of Our Own. They usually have a wide variety of fanfictions for different pairings.
The character development in these fanfics can be really appealing. We can see how Accelerator, who is already a complex character, grows and changes in relation to Last Order. And Last Order herself can also have her character expanded upon. Writers can delve into their emotions, thoughts, and how they interact with each other on a more personal level, which makes the fanfics interesting to read.