The plot could revolve around a love - hate relationship. Ichigo, with his sense of justice, might be appalled by some of Cersei's actions at first. However, Cersei could be intrigued by Ichigo's power and different values. As they interact more, there could be a series of events that force them to rely on each other, like a looming war in Cersei's world that Ichigo gets dragged into. Their relationship could then develop into something more than just animosity, with elements of respect and perhaps even a strange form of love growing between them.
It's Ichigo and Cersei. Ichigo, who might be seen as an outsider in Cersei's world, brings his own set of values and powers. Cersei, on the other hand, is deeply entrenched in her own world's politics and power dynamics. The contrast between them, one being a more straightforward hero - type and the other a conniving politician, makes for an engaging combination as the main characters in this fanfiction.
Perhaps a plot where Cersei, in a moment of desperation, summons Naruto using some dark magic. She hopes he can help her against her enemies. Naruto, being Naruto, wants to find a more peaceful solution. This leads to a series of events where Naruto has to navigate the political minefield of Westeros while also trying to reform Cersei's ways.
A plot could involve Ururu getting injured while protecting Ichigo. Ichigo feels guilty and takes it upon himself to nurse her back to health. During this time, they share many intimate conversations. Ururu's vulnerability makes Ichigo more protective of her, and he starts to develop romantic feelings. Ururu, in turn, is touched by his care and reciprocates those feelings.
In an 'ichigo crossover lemon fanfiction', perhaps there is a curse that turns Ichigo's world into a lemon - filled landscape. He has to cross over to different dimensions to find the source of the curse. Along the way, he meets various characters who are either affected by the lemon - related changes or are trying to stop it. His sword skills could be combined with lemon - related magic or abilities that he discovers during his travels.
It could be about a moment of unexpected closeness between Ichigo and Rukia in a closet. Maybe they are hiding from some danger or just stumbled into this confined space, and this leads to some deep conversations and a new understanding of their relationship.
One possible plot could be that Ichigo and Jackie meet in a strange, otherworldly setting. Maybe they are both on a quest for a powerful and rare item. They start as rivals, each thinking the other is after the item for the wrong reasons. But as they face various challenges together, they begin to understand and respect each other, and eventually form a strong bond.
One common theme is power play. Given Cersei's character, power is often a central aspect in these fanfictions. The relationship between her and the OC might involve a struggle for power or an exchange of power in a more intimate context. Another theme could be secrecy, as their relationship might be something that needs to be hidden in the world of the story.
One possible plot could involve Ichigo's spiritual energy causing a ruckus in the DxD world. His power might be misinterpreted, and he has to prove that he's not a threat. At the same time, he could learn some unique abilities from the DxD characters, and they from him. For example, the devils in DxD might be interested in Ichigo's zanpakuto and its powers, while Ichigo could gain some knowledge about magic from them.
One interesting plot could be that Ichigo and Naruto are brought together in a strange alternate dimension. In this dimension, they have to team up to fight a new common enemy that has powers combining the Hollow and the Nine - Tails. They start off not understanding each other's abilities but gradually learn and combine their powers in unique ways to defeat the enemy.
One possible plot could be that Ichigo gets sent back in time accidentally due to some of Kisuke's experiments gone wrong. He then has to figure out how to get back to his own time while also dealing with the past versions of his friends and enemies. Kisuke, of course, feels responsible and tries to help him.