Kikyo might also play an important role. There could be a sort of rivalry between her and Dark Miko Kagome. Kikyo might see Kagome's new form as a threat or perhaps as a perversion of the power she once had. Their interactions could be full of tension and power plays.
Sango could be an interesting character as well. She might be one of the few who tries to understand Kagome without judgment. Sango, with her own experiences of dealing with dark forces, could offer support and advice to Kagome. She could also be the voice of reason when others are too quick to condemn Kagome for her new state.
Inuyasha can be really interesting in this context. His reaction to Kagome's transformation into a Dark Miko would be complex. He's used to the normal Kagome, so seeing her change might make him both worried and a bit on edge. He could try to bring her back to her old self while also being in awe of her new power.
Some popular themes could be the exploration of Kagome's darker side. Maybe her struggle with newfound powers that have a 'dark' element to them. For example, she might have to deal with powers that are a bit more aggressive or uncontrollable compared to her usual abilities.
Inuyasha could be one of the main characters. Since he has a strong connection with Kagome in the original story, he might also be involved in the time - traveling adventure. Maybe he follows Kagome back in time or is already in the past waiting for her.
Kagome could encounter other skilled fighters from different realms. They might be human - like her - but with extraordinary abilities. Or she could run into some strange and magical creatures that are only found in the area where the Dark Tournament is held. There could also be some characters who are there for their own secret reasons and Kagome gets caught up in their plots.
Sakura could also be an ally. As a medic - ninja, she could help Kagome if she gets injured. And Sakura is used to dealing with strange situations and new people, so she would be open to helping Kagome.
One possible main character could be the town's healer, Elena. She might have some knowledge about love potions and could either help or hinder Miko's progress. Also, there could be a mischievous imp named Puck. Puck loves to cause trouble and might steal Miko's love potions to create more chaos in the town. These characters would add different dynamics to the fanfiction.
She could meet a wise old hermit who has been living in seclusion for centuries. This hermit could possess great knowledge about spiritual powers and could teach Kagome how to enhance hers. Another potential character is a powerful warrior from a different tribe. They might initially be hostile but later become friends and train together.
The cultural clash is also a really interesting aspect. Kagome comes from a very different cultural background than the modern - day Avengers. So seeing how she reacts to things like Stark's flamboyant lifestyle or Captain America's old - fashioned values can make for some great reading. In some fanfictions, this clash leads to humorous situations as well as deep character growth for both Kagome and the Avengers.
Often in dark fanfiction, both characters are put through extreme situations that force them to adapt. Sesshomaru may have to rely on Kagome's unique powers in ways he never thought he would, and Kagome might have to learn to trust Sesshomaru's brutal methods of dealing with threats. This mutual adjustment and growth is a key aspect of how they develop in these types of stories.
One possible storyline could be a dark version where Sesshomaru is forced to protect Kagome in a world filled with malevolent spirits far more powerful than in the original story. Their relationship becomes a complex web of dependence and distrust as they struggle to survive.
Some fanfictions also pair Kurapika with Kagome. Kurapika's elegance and his quest for revenge can be a great backdrop to a relationship with Kagome. She could potentially help him find a more peaceful path with her empathetic nature, and their story could be full of emotional depth and exploration of different values in their respective worlds.