One common plot is that Karin uses her unique abilities as a sensor - type ninja to get closer to Suigetsu in a seductive way. For example, she might sense his emotions and use that knowledge to her advantage. Another plot could be that they are on a mission together, and Karin decides to try and seduce Suigetsu to make the mission more interesting or to gain some sort of upper hand. Sometimes, it might also involve a love triangle situation where Sasuke is somehow involved, and Karin's seduction of Suigetsu is a way to make Sasuke jealous.
One idea could be a story where Naruto and Sasuke have to team up with Karin to face a new, powerful enemy. Maybe they initially don't trust Karin completely, but as they go through battles together, they start to respect her abilities more and form a strong bond as a team.
In the Naruto universe, Karin seducing Suigetsu is more likely to be just a fanfiction concept. Their personalities are quite different. Karin is often very focused on Sasuke, and Suigetsu has his own goals and a rather brash personality. While in fanfiction, authors can create all kinds of scenarios for them to interact in a seductive way, it doesn't seem very likely within the main storyline's character dynamics.
A possible plot could be that Karin discovers a hidden power within herself that could either save or destroy the ninja world. Naruto and Sasuke, being two of the most powerful ninjas, are called upon to either help her control it or stop her if she goes rogue. This would create a complex dynamic between the three characters as they grapple with trust, power and their own personal beliefs.
In some Naruto fanfictions, Karin might succeed in seducing Sasuke. However, it really depends on the writer's take on the characters and the plot they've crafted. Some fanfic authors might want to explore a more romantic or complex relationship between them, while others may keep Sasuke completely focused on his revenge and not be swayed by Karin's attempts at all.
In the realm of fanfiction, almost any scenario is possible. Regarding Sasuke divorcing Sakura for Karin, it may exist. Fanfiction authors draw inspiration from the source material and then take it in new directions. The idea might stem from Karin's past feelings for Sasuke and some fans' desire to see how such a relationship shift would impact the characters. It could also be a way to explore the characters' personalities more deeply, for example, how Sakura would cope with such a betrayal and how Karin would handle being with Sasuke in that context.
Yes, there are likely some fanfictions out there where Sasuke marries Karin. You can try searching on popular fanfiction websites like FanFiction.net or Archive of Our Own (AO3).
There probably is. Fanfiction writers like to take existing characters and create different storylines. But it's important to note that this isn't part of the official Naruto story. In the original, Sasuke and Sakura are a couple, and Karin has her own relationship with Sasuke which is more of comradeship in the official plot. Fanfiction just gives people the freedom to deviate from the original.
In Naruto fanfiction where Karin tries to seduce Sasuke, a prevalent theme is manipulation. Karin is often portrayed as a character who is not above using her femininity to manipulate Sasuke for her own ends. Another common theme is the exploration of Sasuke's character. How he responds to her seduction attempts can show different aspects of his personality, like his self - control or his susceptibility to emotional manipulation. Additionally, the theme of redemption can be present. Karin might be trying to seduce Sasuke as part of her own journey towards redemption or a change in her character.