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.