In some fanfictions, their love is often portrayed as a complex and somewhat tragic relationship. Given their nature as a ghoul and a half - ghoul in the Tokyo Ghoul story, there are often elements of danger and secrecy.
Well, in fanfiction, the relationship between Eto Yoshimura and Rize's brother could be very complex. It might involve them being on opposite sides in the ghoul - human conflict. Maybe Eto, as a powerful ghoul, could see Rize's brother as a threat or an ally depending on the plot twists in the fanfiction.
I think a 'brother to lover' fanfiction about Rize Kamishiro might explore complex emotions. It could delve into the initial bond of brotherhood and how it gradually transforms into romantic love. Maybe it would show their internal struggles as they deal with this shift in feelings, especially considering the social taboos often associated with such a relationship in many cultures.
The theme of redemption can also be present. Rize's actions towards Kaneki were quite cruel in the original story. Fanfictions may attempt to give her a chance at redemption, perhaps through her relationship with Kaneki. This could involve her showing remorse for what she did and trying to make amends in some way.
In fanfiction, the relationship between Kaneki and Rize can be very complex. Some fanfictions might explore their initial encounter in a more in - depth way, like how Kaneki's life was forever changed after meeting Rize. It could show his internal struggle with his newfound ghoul nature which was a result of Rize's actions.
A fanfic could focus on the backstory of the Kamishiro brothers. Explore their childhood, how they discovered their powers, and what led them to become who they are. Maybe there was a tragic event in their past that shaped their personalities and made them so close to each other.
One aspect that could make it appealing is the exploration of deep emotional connections. Moving from a brotherly bond to a romantic one involves a whole range of emotions like confusion, guilt, and ultimately, deep love. The 'OC' in the fanfiction can also introduce fresh perspectives and storylines that can enhance the overall allure of the narrative. It allows for creativity in how the relationship unfolds and how the characters interact with this new situation.
In some fanfiction, their kiss might be a very passionate and intense moment. It could be described with a lot of detail, like the way their lips meet and the emotions that flood through them at that instant.
You can try some popular fanfiction websites like Archive of Our Own (AO3). It has a large collection of various fanfictions, and you might be able to find some great ones about Kaneki and Rize there.
One possible storyline could be that they are rivals in the ghoul underworld. Eto, with her intelligence and power, might see Rize's brother as someone who could challenge her authority. So, there could be a power struggle between them throughout the fanfiction.