The theme of detective work often comes up in Tim Drake fanfic. Since he's known for his detective skills, fanfics will have him solving mysteries in Gotham. Also, his struggle to balance his normal life and his superhero life is a common theme.
One common theme is friendship - turned - romance. Their initial bond as friends in the superhero world often transitions into something more. Another theme is self - discovery. They both learn more about themselves as they explore their relationship.
Another theme could be loneliness. Tim Drake himself can be a lonely character, and the concept of a stray adds to that. Fanfictions might explore how two lonely beings, Tim and the stray, find solace in each other's company. It could be about them forming an unexpected bond that helps them both deal with their isolation.
One common theme is secrecy and deception. Since he's undercover, Tim has to constantly deceive those around him, which creates a lot of tension. For example, in many stories, he has to lie to his friends and family about his whereabouts and activities.
The theme of redemption can also be found in some Tim Drake Joker fanfiction. There could be a scenario where the Joker has a moment of change, or Tim tries to find some good in the Joker. However, this is a more complex and less common theme compared to the others as the Joker is usually seen as an irredeemable villain.
One common theme is loneliness. Tim is often portrayed as being alone, either because he feels he can't connect with others or because he has lost someone important. For example, in many fanfictions, the death of a fellow vigilante or a family member leaves him feeling isolated.
Another theme is morality. Since being an assassin involves killing, he often has to grapple with the right and wrong of his actions. In some fanfictions, he tries to find a way to use his skills for good, like taking down corrupt organizations without sacrificing his principles.
One common theme is redemption. His angelic nature can be used to show how he redeems himself or others in the often - dark Gotham setting. Another is protection. He may use his angel - like powers to protect the innocent in the city.
In baby Tim Drake fanfiction, family is a big theme. Whether it's his original family or the Bat - family, his relationships are explored. The theme of discovery is also there. It's about how he discovers his talents and his place in the world of Gotham. And of course, the theme of heroism starts early. You can see the seeds of his future heroics being sown in these stories.
The theme of loyalty also pops up a lot. Tim has to decide where his loyalties lie - with his new Catlad identity, his friends in the Bat - family, or something else entirely. For example, in many fanfictions, he has to choose between following the Catlad code and helping Batman. And there's often the theme of isolation as well, as he may feel alone in his new role, separated from his former life.
Common themes in Tim Drake and Superboy fanfiction include growth. They are both evolving as heroes, and fanfics often show their personal and heroic growth. Adventure is also a big theme. They go on all sorts of adventures, whether it's in Gotham or Metropolis or other places. Also, the theme of identity. They both have complex identities, with Tim being Robin and Superboy having his own set of powers and origin story, and fanfics sometimes dig into how these identities interact.