A common theme is the unlikely friendship. Given their different personalities - Kenpachi being bold and battle - hungry and Hanatarou being more timid and healer - like, their friendship development can be an interesting theme.
Well, you can try looking on fanfiction.net. There are often a variety of stories in different genres related to this pairing. Some might focus on their adventures together in the Soul Society, while others could explore a more emotional bond between them.
One great toshiro x hanatarou fanfiction might be 'A Bond Beyond Ranks'. It delves into their relationship as they face challenges together in the Soul Society. The way the author portrays their mutual respect and growing friendship is really engaging.
Fanfiction.net is also a good place to look. There are many Bleach - related fanfictions on that site. However, the quality may vary, so you might need to sift through some to find the really good toshiro x hanatarou stories.
One idea could be a story where Orihime gets into trouble during a battle and both Kenpachi and Byakuya have to put aside their differences to rescue her. Kenpachi might be all about brute force in the rescue while Byakuya uses his elegant and strategic combat style.
However, Orihime shouldn't be underestimated. Her healing abilities and unique powers could make her the most dominant in a situation where the survival of the group depends on staying alive and healthy. If she can keep Kenpachi and Byakuya in top shape during a long battle or difficult situation, she becomes the key factor, making her dominant in that sense.
Well, one interesting aspect could be the unique dynamic between Kenpachi and Ichigo. Their personalities are so different - Kenpachi is all about brute strength and a love for battle, while Ichigo is more complex with his inner struggles and sense of justice. In the fanfiction, it might explore how they interact in situations that are different from the original storyline. Maybe it shows them teaming up in a new way or having some sort of friendly rivalry that takes an unexpected turn.
One popular one might be 'Bond Beyond Battle' which delves into the unique relationship between Kenpachi and Ichigo in a mpreg scenario. It focuses on how they navigate the challenges that come with it, like dealing with the reactions of their friends and foes alike. The story also has some great character development for both of them as they face this unexpected situation.
Well, 'Kenpachi x reader fanfiction' often varies in quality. However, 'A Day with Kenpachi' is quite charming. It's about a day in the life where the reader gets to experience Kenpachi's world up close. 'Kenpachi's Protective Side' is also good. It focuses on how Kenpachi would protect the reader in different situations, showing his softer side in a rough exterior world. And don't forget 'Kenpachi's Training Partner' where the reader becomes his training partner and the relationship that sprouts from that.
You can start by looking on fanfiction websites like Archive of Our Own (AO3). It has a large collection of Bleach - related fanfictions, and you might be able to find some Kenpachi x Ichigo mpreg ones there. Just use the search function and type in the relevant tags.