A possible fanfiction plot is that Grell and William are given a mission to protect a special soul from being corrupted by a powerful demon. Along the way, Grell's flamboyant nature clashes with William's strict sense of duty, but they find that their combined skills are the only way to succeed. Or perhaps there's a plot where they get trapped in a magical realm and have to find their way out while dealing with their own complex relationship and the strange creatures in the realm.
Some fanfictions might explore a plot where Grell accidentally gets a part of William's memories. This leads to Grell seeing a different side of William and trying to get closer to him in a more understanding way. There could also be a plot where they are in a competition for a promotion in the reaper world. However, they end up realizing that they are better off working together than against each other and form an unlikely alliance.
One interesting plot could be Grell and Undertaker teaming up to solve a mystery in the underworld of the Black Butler universe. Maybe they discover a new kind of demon or a secret about the reapers that has been hidden for ages.
There are many 'Black Butler Grell fanfiction' that focus on his unique personality. For instance, a fanfiction might show Grell trying to improve his reaping skills in a more humorous way. He could be constantly getting into trouble while attempting to be a better reaper, like accidentally scaring away the souls he's supposed to reap. Or, a story could be set in an alternate universe where Grell is not a reaper but a normal human with his flamboyant personality intact, and how he navigates the human world.
Grell is impulsive and often acts on his desires, while William is more calculated. In fanfiction, this can result in interesting dynamics. Grell might drag William into unexpected situations, like chasing after a rare soul just because it looked interesting. William, on the other hand, would be trying to keep everything in line. Their personalities also have room for growth in fanfiction. Maybe Grell learns to be more disciplined from William, and William learns to loosen up a bit from Grell.
One interesting fanfiction could be about Sebastian and Grell being forced to work together on a special mission in the human world. They start off hating each other but gradually develop an understanding. Another might involve Grell having a crush on Sebastian in a more comical way, like constantly trying to impress him with her 'reaping' skills but always messing up. There could also be a fanfic where they are both trapped in a magical realm and have to rely on each other to escape.
One interesting storyline could be a time - traveling adventure where Grell and Sebastian are forced to work together to fix a disruption in the timeline that threatens the existence of their world. They might start off hating each other but gradually develop an understanding.
Another theme is 'Redemption'. Maybe Undertaker is trying to redeem Grell from some of his more... extreme actions. This could lead to a lot of character development and interesting plotlines.
One great fanfic could be 'The Unlikely Bond'. It delves into the complex relationship between Undertaker and Grell. It shows how their interactions change over time as they face various challenges in the Black Butler universe. The story is full of interesting twists and turns that keep you hooked.
One popular trope is the 'love - hate' relationship. Grell is head - over - heels for Sebastian, but Sebastian is mostly indifferent or even annoyed. Another is the 'rivalry' trope, as they are both strong in their own ways. Grell with his unique scythe skills and Sebastian with his demonic powers.
In Black Butler fanfiction, Grell and Sebastian have a complex relationship. Grell is often portrayed as being obsessed with Sebastian. Their relationship is a mix of rivalry and an odd form of attraction. Grell's flamboyant nature contrasts with Sebastian's composed demeanor, which makes their interactions interesting.
In Black Butler Sebastian x Grell fanfiction, there are several prevalent themes. The first is the contrast between their personalities. Sebastian is cool, collected and sly, while Grell is passionate, flamboyant and somewhat chaotic. Writers often use this contrast to create humorous or tense situations. Another theme is the exploration of their supernatural natures. As a demon and a Grim Reaper, they have different abilities and moral compasses. Fanfictions may delve into how these aspects interact when they are together. Additionally, the theme of 'opposites attract' is also popular, with Grell's over - the - top emotions being drawn to Sebastian's stoic exterior, leading to various relationship - based storylines.