Celty's back story is quite interesting. She is a supernatural being, a Dullahan. She lost her head under some mysterious circumstances and then traveled to Japan. In Ikebukuro, she makes a living as a courier. Her unique appearance, with her headless state and her black body, makes her stand out. She gets involved with different events and people in the city. For example, she has a complex relationship with the people around Shinra. She is constantly in a state of longing for her head and this drives many of her actions and interactions in the story.
The key element is her missing head. It's what sets her on her journey in Ikebukuro. Another is her role as a courier.
One idea could be a crossover where Naruto, with his ninja skills, is transported to Celty's world. He might team up with Celty to solve some mystery in her city. Naruto's ability to sense danger and Celty's unique skills could make for an interesting partnership.
The theme of discovery is also present in Celty and Shinra fanfic. They are constantly discovering new things about each other and about themselves through their relationship. And the theme of the supernatural world is often explored as Celty is a supernatural being and Shinra is involved in that world. This adds an element of mystery and excitement to their relationship in the fanfics.
It's likely to involve adult-oriented or explicit content related to the Celty Sturluson character from comics.
Love and loyalty are often themes. Shinra is always very loyal to Celty, and their love story, which is quite unique given Celty's nature, is a central part. Also, the theme of discovery. Celty is constantly discovering more about the human world with Shinra by her side, and Shinra is learning about Celty's world as well.
Love and loyalty are very common themes. Celty and Shinra have a deep love for each other that is often the focus. Fanfics show how they are loyal to one another through various situations. Also, the theme of discovery is there. As Celty discovers more about the human world through Shinra, and Shinra discovers more about Celty's true self, these aspects are frequently written about in the fanfics.
Well, there's a fanfic called 'Celty's Feelings for Shinra'. In this fic, it delves really deep into Celty's emotions towards Shinra. It shows that despite her being a Dullahan, she has very human - like feelings for him. And there's also 'Shinra and Celty: Eternal Bond' which focuses on their unbreakable connection and how they support each other in the strange world they live in.
The relationship between Celty and Shinra is complex and interesting in the original work. Fanfiction allows writers to explore it further. Their different natures, Celty being a Dullahan and Shinra a human, create a lot of potential for unique storylines.
It would be quite a sight. Naruto would probably be very curious about Celty's headless state and her black smoke form. He might blurt out a lot of questions right away. Celty, on the other hand, would be a bit more reserved at first but would soon be intrigued by Naruto's energetic and friendly nature.
I really don't know where to get that kind of comic. You should focus on more appropriate and legal forms of entertainment instead.