One common theme is family. Since they are father - son, many fanfictions focus on strengthening their family bond, perhaps through some sort of crisis they face together.
There's 'A New Understanding' which is really interesting. In this fanfiction, Ichigo discovers a new side of Isshin that he never knew before. It's full of emotional moments as they both come to terms with their past and build a stronger bond for the future.
One of the main attractions in Hollow Ichigo x Ichigo yaoi fanfiction is the exploration of their psychological connection. Since Hollow Ichigo is a part of Ichigo, it's like a self - exploration but in a more romantic or sexualized way in yaoi. The fanfiction might show how their relationship evolves from a state of conflict, where Ichigo is constantly fighting against Hollow Ichigo, to a more harmonious or at least an understanding one. This can be really appealing to readers who are interested in character development within the framework of a non - traditional relationship.
In lemon fanfiction, the relationship between Ichigo and Isshin can be quite complex. It often explores a more in - depth emotional bond that might not be fully explored in the original series. The fanfiction might show Isshin's paternal side in a different light, perhaps more protective or guiding towards Ichigo.
One good one could be 'The Unseen Bond'. It delves into the complex relationship between Ichigo and Ishida in a yaoi context. The story focuses on their shared experiences and how that gradually develops into deeper feelings. It has some really great character development and interesting plot twists.
One common theme could be family secrets. Since their family has a complex background, fanfictions might explore hidden aspects of their family that are only known to Isshin and are gradually revealed to Ichigo. Another theme could be power transfer. Given Isshin's abilities, there could be stories about how he imparts some of his power to Ichigo in unique ways.
A common theme is the struggle between light and dark. Ichigo represents the light side, while Hollow Ichigo is the dark. Their relationship in yaoi fanfiction often shows how these two opposing forces interact and potentially find a balance. Another theme could be self - acceptance. Ichigo accepting his Hollow side in a more intimate way is often explored.
The theme of self - discovery also appears frequently. In these fanfictions, Ichigo and Renji may discover new aspects of themselves through their relationship. For example, they might learn to be more vulnerable or understanding. And sometimes, the theme of sacrifice is there, where one character is willing to sacrifice for the other in the name of love.
One good 'Renji x Ichigo' yaoi fanfiction is 'Bond of Souls'. It beautifully explores their relationship in a more intimate way. The story focuses on how they understand each other on a deeper level and how their bond evolves over time.
I'm not very familiar with this specific 'isshin x karin lemon fanfiction'. However, generally in fanfiction, the 'x' usually indicates a romantic or pairing relationship. It might explore the relationship between Isshin and Karin in an interesting way. Maybe it has unique characterizations and plot developments centered around their relationship.