Caius Volturi is one of the Volturi leaders in the 'New Moon' novel. He is part of the powerful vampire coven in the Twilight series. He is often portrayed as rather strict and unforgiving when it comes to enforcing vampire laws.
One great Caius Volturi and Bella fanfiction is 'The Volturi's Obsession'. It explores an alternate universe where Caius has a more complex relationship with Bella. Another is 'Caius and Bella: A Forbidden Bond' which delves into the challenges they face due to their different natures.
The themes of transformation and self - discovery are quite common. Bella's transformation into a vampire (if it occurs in the fanfic) and how that affects her relationship with Caius is often explored. Caius, too, may go through a form of self - discovery as he gets involved with Bella. Another theme is the struggle against fate. Their relationship is often seen as something that is not meant to be according to the rules of their world, but they fight against that in the fanfiction.
They're an interesting pairing because they are so different. Caius is from the ancient and powerful Volturi, with a strict view of vampire laws, while Bella is a human - turned - vampire with a very different moral compass. This contrast can lead to really engaging storylines in fanfiction.
Some fanfictions explore a scenario where Caius and Bella form an unlikely friendship. Maybe Bella is sent to the Volturi as an emissary from the Cullens and Caius, initially cold, slowly warms up to her because of her unique perspective on the vampire - human world.
Yes, there are quite a few. Some popular ones can be found on fanfiction.net. You can search using the tags 'Bella Swan' and 'Caius Volturi' to narrow down the results. They often explore unique relationships and storylines within the Twilight universe.
One common theme is loyalty. They are loyal to each other in the midst of the often cut - throat Volturi environment. Also, the theme of sacrifice. There are fan fictions where one of them has to sacrifice something for the other or for the greater good of the Volturi. And of course, the theme of immortality and how it affects their relationship over time. They have an eternity together, and fan fictions explore how that long time span shapes their connection.
Another theme is the exploration of the Volturi world through Bella's eyes. Since she was not initially part of the Volturi, her perspective can be used to show the reader more about their customs, politics, and how Caius fits into all of that. This can range from descriptions of the Volturi castle to the complex relationships between the Volturi members as Bella experiences them while getting closer to Caius.
Well, a frequent theme is the exploration of different vampire cultures. Caius being part of the Volturi, his relationship with Bella can show how different vampire groups interact. Also, the theme of redemption can be present. Maybe Caius is seen as a rather cruel character in the original, but in fanfiction, his relationship with Bella can lead to a path of redemption for him. And of course, there's always the theme of love defying boundaries, as their union would be quite unexpected in the context of the Twilight world.