Power dynamics is a common theme. Given that Guy is extremely powerful and Rimuru is rapidly growing in power, how they interact in terms of who has more influence is often explored.
Shankish and Sauron were two important characters in One Piece. They had a deep friendship and a relationship of mutual trust. In some of One Piece's doujinshi works, they might have some special interactions or pairing. However, due to the complexity of One Piece's storyline and character setting, the specific doujinshi works may vary from author to author, so there is no guarantee that all doujinshi works are accurate.
Goku would probably be very friendly with Luffy. They both love to fight strong opponents and have a sense of adventure. Goku might be a bit confused by some of the wacky things in the One Piece world like the Devil Fruits at first, but he'd quickly adapt. He'd also likely be impressed by the determination of the other characters like Zoro and Sanji.
Their relationship could start as a cautious alliance. Rimuru, being a slime who has built his own community, would be wary of Luminous at first. But as they face challenges together, they start to respect and trust each other more.
One good Carrot x Reader fanfic could be centered around an adventure where the reader and Carrot explore a new island together. They might encounter unique creatures and face challenges side by side, strengthening their bond in the process.
In One Piece, the relationship between Luffy and Nami is complex. There are many instances where they show great care for each other. For example, Nami is often worried about Luffy when he gets into dangerous battles. Luffy, on the other hand, will do anything to protect Nami. While it may not be an out - and - out love story like in a traditional romance, there is definitely a strong and unique relationship that has elements of love in the form of deep friendship and loyalty.
Among the main characters besides Rimuru are Gobta. He is a goblin who is rather comical at times but also shows growth throughout the story. Then there is Diablo, a very powerful demon who becomes Rimuru's subordinate. His power and knowledge contribute to Rimuru's rise in the world of the novel. There are also other characters like Milim, a dragonoid with a child - like personality who has her own impact on the overall plot.
I've heard of 'Guy and Rimuru: A Different Path'. In this fanfic, it takes an alternate universe approach. Guy Crimson and Rimuru meet under very different circumstances than in the original story. Their relationship starts off rocky but then they discover they have more in common than they thought, leading to a heartwarming friendship.
One interesting fanfic could be about their first encounter from a different perspective. Maybe it focuses on Guy Crimson's initial thoughts about Rimuru which were a mix of curiosity and wariness. In this fanfic, their relationship could develop as they face a common enemy together, gradually growing to respect and trust each other.
One popular Rimuru x Guy fanfiction is 'The Unlikely Bond'. It explores their unique relationship in a new world setting, with Rimuru's naivete and Guy's powerful presence creating interesting dynamics.