A third theme is sacrifice. Sometimes, Erwin has to sacrifice his own needs or wants in order to help Levi. This could be in terms of time, energy or even putting himself in danger. It shows the selfless nature of their relationship in these fanfictions.
Another good one could be 'Towards Recovery'. This fanfiction shows Levi struggling with his inner demons and Erwin being his pillar of support. It has some really touching moments that show the strength of their bond.
It could be an antagonist. Some villain who has a grudge against Toby or the group he is associated with. This villain might see Toby as an obstacle and deliberately target him to cause harm.
One popular Levi Hurt fanfiction could be 'Levi's Struggle'. It delves deep into his emotional pain after a difficult battle. The author beautifully portrays his internal turmoil.
One possible plot could be that Toby gets physically hurt during a mission or an encounter with an enemy. Maybe he's protecting someone and takes a blow that leaves him injured. Another could be that he gets hurt emotionally, like being betrayed by a friend or someone he trusts, which leads to his internal pain and struggle.
The theme of hope in the face of adversity is also present. Despite Levi getting hurt, the fanfiction may show how the characters around him and he himself still hold on to hope for recovery and victory in the long run.
One common theme is physical injury. Writers often depict Levi getting hurt during battles, which shows his vulnerability despite his tough exterior. For example, he might get seriously wounded in a fight against Titans and have to struggle to recover.
Some 'levi gets hurt fanfiction' might focus on the recovery process after Levi gets hurt. It could show how he deals with his own physical limitations during the recovery, and how his relationships with other characters change as a result of this new vulnerability.
One common theme is physical injury during battles. Given Levi's role as a strong fighter in AOT, fanfictions often explore scenarios where he gets seriously injured in combat, like being wounded by Titans or in fights with other humans. This could lead to his comrades having to take care of him, creating moments of vulnerability and bonding.
You can start by looking on popular fanfiction websites like Archive of Our Own (AO3). Just type 'Levi Hurt' in the search bar and a whole list of relevant fanfictions will come up.