Some fanfictions use the 'parallel journey' trope. The Kid OC is on a journey similar to Batman's, like seeking justice for a loved one's death. There's also the 'fish - out - - of - - water' trope, especially if the Kid OC is from a different part of the world or a different social class. They struggle to adapt to the dark and dangerous Gotham while also trying to fit into Batman's world.
The 'mysterious origin' trope is also popular. The Kid OC has a past that's slowly uncovered throughout the fanfiction. There's the 'sidekick - in - training' trope too, where the Kid OC dreams of becoming Batman's sidekick and has to prove themselves. In some cases, there's the 'protective instinct' trope, where Batman feels a strong need to protect the Kid OC from the dangers of Gotham.
One common trope is the 'lost kid' trope. The Kid OC is lost in Gotham and Batman takes them under his wing. Another is the 'unexpected help' trope, where the Kid OC has a special ability that helps Batman solve a case he was struggling with. And the 'innocent perspective' trope, where the Kid OC sees the dark world of Gotham in a different, more innocent way than Batman.
One common trope is the OC being a new student or outsider in the fanfiction world. For example, in a Harry Potter fanfic, an OC might be a transfer student to Hogwarts. Another is the OC having a special power or ability that sets them apart. They could be the only one who can communicate with a certain magical creature. Also, the OC might become a love interest for a canon character, like an OC falling in love with Sherlock Holmes in a Sherlock fanfiction.
Some common tropes in villain oc fanfiction include the 'seductive villain' trope. This is when the villain uses their charm or attractiveness to manipulate others. It can add an interesting dynamic to the story. The 'vengeful villain' trope is also quite common. They are seeking revenge for some past wrong done to them. And then there's the 'evil legacy' trope. The villain oc is following in the footsteps of an even greater evil from the past, and they are trying to live up to that reputation or complete some unfinished evil business.
One common trope is the 'forbidden love' between the OC and Dracula. The OC, whether human or vampire, finds themselves drawn to Dracula's dark allure despite the danger. Another is the 'newbie in the vampire world' trope, where the OC is a newly turned vampire trying to navigate the rules and power dynamics in Dracula's domain.
In Kingdom Hearts OC fanfiction, a popular trope is the 'Mysterious Past'. The OC has a past that is slowly uncovered throughout the story, often involving a connection to a great evil or a long - lost prophecy. The 'Forbidden Love' trope also appears sometimes, where the OC falls in love with a character that they shouldn't, perhaps a Heartless or a character from an opposing side. Additionally, the 'Chosen One' trope is common, with the OC being the only one who can save the Kingdom Hearts universe from a new and greater threat.
Well, in Gundam male OC fanfiction, you often see the 'Lost Legacy' trope. The male OC discovers that he has a connection to an ancient or forgotten part of Gundam history, like a lost Gundam technology or a long - dead hero. Another common one is the 'Redemption Arc' for a character who has made mistakes in the past. The male OC might have been on the wrong side of a conflict initially but then sees the error of his ways and tries to make amends. And there's the 'Outsider Who Becomes a Hero' trope, where the OC is not from the main group but ends up being crucial to their success.
One common trope is the 'forbidden love' angle. Since Thranduil is a king, there could be rules or social hierarchies that make a relationship with an OC difficult. Another is the 'outsider' trope, where the OC is not an Elf and has to navigate the Elven world while falling for Thranduil. The 'saving each other' trope is also popular. Maybe the OC saves Thranduil from a dangerous situation, or vice versa, which then sparks the romance. And there's often the 'slow - burn' romance, where their feelings develop gradually over time.
The 'slow - burn relationship' is also very popular. The OC bodyguard and Lelouch start off as just professional acquaintances but over time, feelings develop. This can be shown through small moments of kindness or shared secrets. Another trope is the 'protector in disguise' where the bodyguard has to pretend to be something else in order to better protect Lelouch, like a student at his school.
In such a fanfiction, the kid OC might start by being in awe of Batman. They could end up helping Batman solve a small mystery in their neighborhood. Maybe the kid has some unique skill or knowledge that Batman finds useful.
One common trope is the 'gamer - in - a - strange - world' concept. The OC, being a gamer, finds themselves in the Bleach universe and has to adapt. Another is the 'level - up' trope. Just like in games, the OC gains power and abilities as they progress through the story. For example, they might start as a weak character and gradually become a powerful Soul Reaper or Arrancar. The 'unique - ability - from - gaming' trope is also popular. This is where the OC has an ability that is related to their gaming skills, like being able to analyze an opponent's moves like it's a game strategy.
One common trope is the 'fish out of water' situation. For example, if the OC is from a different time or place than the canon world, like an OC from modern times ending up in Middle - earth in a Lord of the Rings 'oc x cannon fanfiction'. Another is the 'love at first sight' trope, where the OC and the canon character fall for each other immediately. It's often used to quickly establish a relationship in the story.