A fresh plot. Instead of just rehashing the same old Batman stories, a great 'dark knight oc fanfic' will have a new and exciting plot. For example, it could involve the OC bringing in a new threat or a new way of fighting crime that Batman has to adapt to. This makes the story more engaging. Also, good writing style is crucial. If the author can write in a way that captures the dark and gritty atmosphere of the Dark Knight world, it will be more appealing to readers.
It often has unique plot twists and unexpected character developments that keep readers engaged.
One thing that might make it stand out could be the concept of a 'time - limited genius'. It could add an element of urgency and uniqueness to the story. The 'dark knight' aspect might bring in elements of mystery and a brooding atmosphere. Maybe the genius character has a limited time to solve a great mystery or defeat an evil force, which would make for an exciting plot.
A unique concept. For example, if the OC has a special power or ability that's not commonly seen in other fanfics. It can make the story more interesting.
Unique character design. If the original character has a distinct quirk and personality that we haven't seen before in the My Hero Academia world, it can make the fanfic stand out. For example, a quirk that combines elements in a really creative way.
A unique OC is key. If the original character has a distinct personality, backstory, and abilities, it can make the fanfic really interesting. For example, an OC with a magical ability in a world of mostly physical fighters like Sara.
The writing style matters a great deal. If the author can write vivid descriptions, whether it's of the harsh landscapes of the North or the opulent halls of the Red Keep, it draws the reader in. Also, the character development of the oc. If they start as one thing and evolve over the course of the fanfic, it can be very appealing. For example, an oc who starts as a naive outsider but becomes a shrewd player in the game of thrones through their experiences. And of course, a good dose of drama and conflict, which is what Game of Thrones is known for.
Good writing quality in general. This includes things like proper grammar, vivid descriptions, and a well - paced plot. If the author can write in a way that makes the readers feel like they are in the Sengoku Basara world, that's a big plus.
The color scheme. A dark red pokemon fanfic often uses the color as a central theme. It could be in the appearance of the pokemon, like a shiny pokemon with a dark red hue. For example, a dark red Charizard would be a really cool concept.
A unique plot. For example, if it shows Sakura dealing with powers she doesn't understand in a new and unexpected way. Like in some fanfics where she gets powers from a forbidden source and has to hide it from her friends.
Another factor is how it fits into the Yu - Gi - Oh! universe. If it can add something new to the existing lore while still feeling like it belongs, that's a big plus. Fanfics that manage to blend her story with other elements of the series in a creative way are always memorable.