One great fanfiction is 'The Trio's Bond'. It delves deep into the complex relationships between Reiner, Bertholdt, and Annie. It shows how their shared experiences in the military and their secrets bind them together in ways that are both heart - warming and full of tension. Another one to check out is 'Among the Three'. This fic focuses on their individual growth while also exploring their interactions with each other, giving a fresh perspective on their characters.
The theme of trust is crucial in 'Attack on Titan Reiner x Bertholdt fanfiction'. They have to trust each other completely in order to survive in the harsh world of Titans. Additionally, the theme of redemption sometimes shows up. If they make mistakes or have actions that they regret, they try to redeem themselves in the eyes of each other and also within the context of their friendship.
The popularity of 'Reiner x Bertholdt x Annie Fanfiction' lies in the complex relationships between these characters. They have a shared past and secrets that fans love to explore in fanfictions. Their different personalities also create a lot of interesting dynamics.
There's a fanfiction named 'Reiner and Bertholdt: A Different Path'. In this story, it takes a different turn from the original plot and focuses more on their relationship outside of the main battles. It shows their more personal side, like how they interact when they are alone. And 'Hidden Feelings' is also a good one. It delves into the emotions that Reiner and Bertholdt might have for each other but keep hidden from others.
Reiner did die in the manga. His death was a result of a series of events and conflicts that had been building up throughout the storyline. It had a major impact on the plot and the other characters.
One common theme is loyalty. Given their situation in the military and the secrets they hold, their loyalty to each other is often explored. Another is the theme of unspoken feelings. They both seem to have deep emotions that they don't easily express, and fanfics often play around with that.
Love and sacrifice are common themes. Often, Reiner has to sacrifice something for the sake of love in these fanfictions. It could be his position in the Legends world or his own safety.