Can you recommend some good 'Black Butler Grell x OC fanfic'?

Well, a prevalent theme is the exploration of Grell's complex personality. Fanfics often show how the OC interacts with his flamboyant, yet deeply emotional side. Redemption is also a theme sometimes. Maybe the OC helps Grell find a new purpose or come to terms with his past actions. And of course, there's the theme of the supernatural world of Black Butler. The OC gets to experience all the dark and mysterious elements of that world through Grell, like dealing with other reapers, demons, and the afterlife in general. This makes for really exciting and often very emotional stories.

I also like 'Grell's Adventure with the Butler'. It takes Grell on an unexpected journey with the butler, and throughout the story, there are a lot of emotional moments as well as some comical ones. It shows a different side of Grell that you might not expect at first.

There's 'Grell's Hidden Depths'. This fanfiction focuses on Grell's inner thoughts and feelings. It shows a side of him that we don't often see in the original series. It has a lot of emotional moments and some really creative plot twists that make it a great read for any 'Black Butler' and Grell fan.

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.

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 popular 'Black Butler OC Reincarnation Fanfic' is 'A New Life in Black Butler'. It has an interesting plot where the original character reincarnates into the Black Butler world and has to navigate through the complex relationships and mysteries. Another one could be 'Reincarnated into Black Butler's Dark World' which focuses on how the OC deals with the dark and dangerous aspects of the Black Butler universe. There are also many others that can be found on fanfic platforms by simply searching for the relevant tags.

There's also 'Love in the Reaper's Realm'. This fanfiction creates a whole new world for Grell and the OC to exist in. The OC is from a different background and their encounter with Grell is filled with misunderstandings at first, but as the story progresses, they start to understand each other on a deeper level.

Yes, there are quite a few. You can start by looking on popular fanfiction websites like Archive of Our Own. There, you'll find a variety of stories exploring the relationship between Grell and Undertaker. Some might focus on their shared history in the 'Black Butler' universe, while others could be more about their potential romantic or comical interactions.

Well, there's a fanfic titled 'Grell's Sister: A New Arrival in the Underworld'. In this one, Grell's sister arrives in the underworld and causes quite a stir. She has a very different personality from Grell, which makes for an interesting dynamic as she interacts with the other characters like Sebastian and Ciel.

I'm sorry I can't directly recommend a specific 'Black Butler Grell's sister' fanfiction. But you can try searching on fanfiction websites like Archive of Our Own. There are likely many stories there related to this topic. Just use the search terms 'Black Butler' and 'Grell's sister' to find relevant fanfics.