Sora could be shown to have a different aesthetic. He might wear darker clothes or have a slightly more brooding look, but his actions and words are always kind and heroic. For example, he could be the one to comfort those who are afraid of the dark, explaining that darkness can also be a part of beauty and protection. He could have a connection to a dark realm, but instead of ruling it with an iron fist like an evil character would, he works to bring light and hope to the beings there.
He can be portrayed as having a mysterious side. Maybe he has a power that is related to darkness, like the ability to disappear into shadows and reappear elsewhere. But he uses this power only for good, such as sneaking past enemies to rescue captives.
They are often portrayed as two souls with a deep connection. Sora is usually the more positive and heroic one, while Roxas has his own kind of edginess. Fanfictions might show them learning from each other.
Good can be portrayed as the characters who uphold moral values, like honesty, kindness, and justice. They might be the ones who help others in need or fight against oppression. Evil, on the other hand, can be shown through characters who are selfish, cruel, and seek power at any cost. For example, in a fanfiction about a post - apocalyptic world, the good characters could be sharing resources while the evil ones hoard them.
A good fanfiction could involve Sora being in a situation where he has to make a deal with a dark entity. He does this not out of evil intent but because it's the only way to save someone he loves. Throughout the story, he struggles to keep his own identity and not be corrupted by the dark influence he has allowed into his life. However, his strong will and good nature prevent him from turning evil, even as he uses the powers granted by the dark entity for a noble cause.
Often, it's through his actions. He might hesitate before facing X or show signs of nervousness like trembling or sweating. His internal monologue in the fanfiction could also reveal his fear, with thoughts like 'I don't know if I can face X this time.'
In fanfiction, Evil Merlin can be depicted as a mastermind behind many dark plots, while Morgana is the face of the chaos they create. For instance, Merlin might be the one secretly pulling the strings, using his magic to make things happen, and Morgana is the one out in the open, using her charm and power to intimidate others. They are like two sides of the same evil coin, complementing each other in their wrongdoings.
In a Naruto - Inuyasha crossover, the neglected dark Naruto could be shown as having a more brooding and angry demeanor. He might have a bit of a rivalry with Inuyasha at first because of their similar temperaments. His dark chakra could attract demons, and he'd have to learn to control it while also dealing with the feudal Japanese setting and the yokai.
Harley Quinn could also be shown as a tragic figure. In the Dark Knight fanfiction, she could be a product of Gotham's corrupt system. Maybe she was failed by the very institutions that were supposed to protect her, which led her to a life of crime. This would add depth to her character and make her more than just a crazy villain.
A 'dark not evil Naruto fanfiction' can be unique by having Naruto's 'dark' aspect be something completely unexpected. For example, instead of the typical dark powers like those related to death or destruction, it could be a power that is dark in appearance but has a very positive effect. Maybe he has a power that looks like it's sucking the life out of things, but in reality, it's just absorbing negative energy and converting it into positive energy. This would be a unique take on the 'dark not evil' concept.
In some fanfiction, the Dark Arts are shown as a misunderstood area of magic. The authors may present characters who believe that the Dark Arts can be used for good if controlled properly, which challenges the traditional view in the original series.
The Dark Mark on Snape in fanfiction can be a key plot device. It might be used to create tension in a story. For example, if other characters discover it, they may question his true allegiance. Writers often explore how Snape deals with the stigma associated with the mark. He could be shunned by some in the wizarding community because of it, and this can lead to interesting character development as he tries to prove himself.