First, create a unique and interesting original character (OC). Think about their personality, abilities, and backstory. For example, you could make your OC a half - demon with a special power related to water. Then, plan out a story arc. Maybe your OC joins Yusuke and the gang on a new mission. Decide how your OC will interact with the existing characters. They could start as an antagonist and later become an ally.
A great character trait for a Yu Yu Hakusho Spirit Detective OC is adaptability. In the Yu Yu Hakusho world, things can change quickly, from the types of demons they face to the rules of the spirit world. Also, having a sense of justice is important. They should be driven to protect the innocent, whether it's humans or good - natured spirits. Additionally, a bit of stubbornness can be good. It can show their determination, like when they're trying to solve a difficult case or defeat a powerful enemy.
First, develop your original character (OC) fully. Decide on their personality, powers, and backstory. For example, if your OC has psychic powers, think about how they got them and how it affects their daily life in the Yu Yu Hakusho universe. Then, plan a plot that involves the spirit detective aspect. Maybe your OC could be a new recruit or have a special mission related to the main story's spirit detective work. Also, study the existing Yu Yu Hakusho world, like its rules of the spirit world, different demon types, and how the spirit detective agency operates. This knowledge will help you create a more believable and engaging fanfic.
One common mistake is making your OC too overpowered. In Yu Yu Hakusho, the characters have their own limits and growth arcs. If your OC is super - strong from the start and can solve every problem easily, it takes away the tension and interest. Another mistake is not staying true to the Yu Yu Hakusho universe's rules. For example, if you create a new type of spirit energy that doesn't fit with the established lore. Also, avoid having your OC overshadow the main characters completely. The story should still be about the world of Yu Yu Hakusho, and your OC should be an addition to it, not a replacement.
Another theme is often the outsider status. Since the character is an original creation (OC), they are likely to be an outsider in the established 'Yu Yu Hakusho' world. This can lead to themes of acceptance or rejection. They may struggle to fit in among the demons, spirit detectives, and other beings in the story. Also, there can be themes related to the witch's origin. Maybe they come from a different dimension or a hidden coven within the 'Yu Yu Hakusho' world, and exploring this origin can be a major part of the story.
The relationship between Kurama and the OC plant demon could be a romantic one. The plant demon might be attracted to Kurama's charm and his connection to the plant world through his own abilities. They could have adventures together, like facing off against other demons who want to destroy the plant demon's home. Kurama would use his strategic mind and combat skills, while the plant demon uses her unique plant - based powers to fight.
There's this fanfiction called 'Kurama's Unlikely Companion'. The OC in it is a bit of an outcast, and Kurama is initially hesitant about getting close. But as the story progresses, they form a deep connection. The story is filled with action and drama, and the relationship between Kurama and the OC is very well - explored.
Well, you can try looking on fanfiction.net. There are often a lot of 'yu yu hakusho' fanfics there. Some might feature witch OCs. You can search for relevant tags like 'Yu Yu Hakusho' and 'witch OC' to narrow down the results.
One idea could be a 'what if' scenario. For example, what if Yusuke had accepted Raizen's offer to become a full - fledged demon right away. Another idea is to focus on the relationships between the characters in a different way, like a deeper exploration of Kuwabara and Yukina's relationship that was only hinted at in the original. You could also do a time - travel fanfic where a character goes back in time to change a key event in the Yu Yu Hakusho story.