Good character development in both the Doctor and the Tardis is key. If a fanfic delves into the Doctor's past experiences with the Tardis and how it has shaped him, and at the same time shows the Tardis evolving in some way, it's bound to be great. For instance, the Tardis could develop new functions based on the Doctor's needs over time. Also, a vivid description of the Tardis' interior and how it feels to be inside it can really make a fanfic stand out.
A really interesting 'Doctor X Tardis' fanfic I've come across is 'Tardis Tales'. In this fanfic, the Tardis has a sort of consciousness that the Doctor tries to fully understand. It delves into the mystery of the Tardis' inner workings and how it has a connection to the Doctor on a deeper level than just being a ship. It's a short but engaging read that will make you look at the Doctor - Tardis relationship in a new light.
A unique plot makes a 'MegaMan X Fanfic' stand out. For example, if it explores a different side of the characters like their fears or dreams that we don't see in the original games. It could also have an alternate universe setting that changes the whole dynamic of the story.
The writing style also matters a great deal. A vivid and immersive writing style can transport the reader into the world of the fanfic. If the author can describe the magical settings, the emotions of the characters, and the action scenes in a detailed and engaging way, it will make the 'Draco x Harry fanfic' stand out. For example, when Draco and Harry are in a tense confrontation, the description of their facial expressions, the magic sparking between their wands, and the thoughts running through their heads can make the scene come alive.
A great 'Mickey x Oswald fanfic' stands out when it has unique characterizations. For example, if it shows a side of Mickey or Oswald that we don't usually see in the official media. It could be Oswald being more confident or Mickey being a bit more mischievous.
A good 'Naruto x Itachi fanfic' stands out when it respects the original characters. For example, Itachi's complex personality, his loyalty to the village yet his love for Sasuke, should be accurately portrayed. Naruto's determination and his ability to see the good in people also need to be there. If a fanfic can build on these traits in a new and interesting way, like making them work together in a unique situation, it will be great.
A great 'Loki x Reader Fanfic' stands out when it nails Loki's character. Since Loki is such a complex character from the Marvel universe, getting his essence right is crucial. If the fanfic can show his mischievous side as well as his more vulnerable side, it becomes really interesting. For example, when he interacts with the reader, his sarcastic remarks but also his moments of sincere connection can make the story shine.
One thing that can make a Shichijou x Nakazawa fanfic stand out is unique character interpretations. If the author gives them traits that are different from the original but still in line with their essence, it can be really engaging. For instance, if Shichijou is made to be more mischievous than usual.
A good Sai x Naruto fanfic stands out when it really explores their unique personalities. Sai is so stoic and Naruto is so full of energy. When a fanfic plays with this contrast, like having Sai be intrigued by Naruto's exuberance, it becomes interesting. For example, if it shows Sai trying to understand Naruto's unwavering belief in his friends, it adds depth to their relationship.
Good character development. If the fanfic allows MJ to grow as a character, perhaps she starts to learn self - defense to be able to help Spiderman better in dangerous situations. It also applies to Peter's growth in his relationship with MJ, like learning to be more open about his feelings.
A standout Stucky x Reader fanfic often has well - developed characters. For example, the reader character should be relatable and have their own personality. In a good fanfic, they don't just exist to be with Steve and Bucky, but have their own goals and desires. Also, the relationship dynamics between the three are crucial. If it's a love story, the way the love develops should be believable.