Well, in the manga, Aoi Tsubaki and Odanna do get married. It's a significant plot point that brings their story to a happy conclusion. The build-up to their marriage is filled with various challenges and sweet moments.
In fanfiction, AOI might often be depicted as a mysterious and powerful figure. For example, in some stories, AOI has unique abilities that are crucial in helping Sakura. Sakura Haruno, on the other hand, is usually shown as brave and determined. She is always ready to face challenges, like in her original story, and her growth as a character is often explored further in fanfiction.
I'm not entirely sure as 'aoi tori visual novel' isn't very well - known to me specifically. It could potentially be a story - driven game that follows the adventures of characters in a world created by the developers. Maybe it has themes related to friendship, love, or self - discovery like many visual novels do.
Another theme could be adventure. They are often put into various dangerous or exciting situations in fanfic, which showcases their courage and the bond between them. For instance, they might embark on a quest to save their world from a mysterious evil force. This not only tests their relationship but also allows for the development of their individual characters in the context of the story.