An engaging plot is also important. If the fanfic has a mystery that Grey has to solve, or a personal quest that he undertakes that's different from his normal duties. Maybe he's trying to uncover a conspiracy within the nobility that involves some dark magic. This can make the fanfic stand out as it gives Grey a new purpose and challenges his skills and character.
A good 'Black Butler Maid Fanfic' stands out when it has well - developed characters. For example, if the maid character has a complex personality, like being kind yet having a hidden strength. Also, a unique plot. If it takes a different angle on the Black Butler world, such as exploring a different time period within the story's universe.
I really like 'Charles Grey: A Hidden Heart'. In this fanfic, the author delves deep into Grey's character, exploring his relationships with other characters in the 'Black Butler' universe. It has some really interesting character development and a great plot that keeps you hooked. For example, the way it shows his interaction with Sebastian is both tense and intriguing.
One great 'Charles Grey Black Butler' fanfiction is 'The Grey Chronicles'. It delves into Grey's backstory before his appearance in the main series. It shows his training days and how he developed his unique skills. Another interesting one is 'Grey's Redemption Arc' which gives a more human side to his character, showing his internal struggles and growth. And 'Charles Grey: The Hidden Past' reveals some secrets about his family that were never mentioned in the original work.
The way the relationship between Undertaker and the OC is developed. It should be more than just a simple love story. Maybe they start as enemies but then realize they have a common goal. Or perhaps the OC is initially scared of Undertaker but then discovers his softer side. Good fanfics explore this relationship in a complex way.
In many Charles Grey Black Butler fanfictions, one unique aspect is the exploration of his relationships. For example, his relationship with the Queen is often delved into more deeply. Some fanfics show a more complex dynamic between them, perhaps a hidden affection or a sense of loyalty that goes beyond what's shown in the original. Another aspect is his combat skills. Fanfictions might expand on how he learned his fighting techniques and his training history.
The unexpected twists. In a black comedy fanfic, things don't go as expected. For example, a character who is supposed to be the hero might end up doing something completely out of character in a hilariously dark way.
A black comedy fanfic stands out when it has a unique and twisted sense of humor. It also needs interesting characters and a plot that keeps you engaged.
A great 'Black Clover Noelle Fanfic' stands out when it stays true to her character. For example, if it shows her strong - willed nature despite her self - doubts. Also, when it expands on her relationships, like her complex feelings towards Asta. A fanfic that gives her new challenges and shows how she overcomes them using her unique water magic can be really engaging.
The unique combat style. Using arrows in an assassin - like way is not common. It gives a different feel compared to swords or other weapons. The black assassin's precision with the arrows is what makes it exciting.
Unique character development. A great Black Reaper Kaneki fanfic will show how Kaneki has changed into this new form, not just physically but also mentally. His thought processes and values might be different as the Black Reaper.