Well, Kirei and Gilgamesh make for an interesting pairing in fanfiction. Their complex personalities can lead to some really intense and thought - provoking stories. Kirei's inner conflict and Gilgamesh's haughty nature can create a lot of drama and tension.
In this type of fanfiction, the 'fated encounter' trope is quite popular. Writers like to show how Kirei and Gilgamesh's paths cross in a way that seems almost predestined. It gives a sense of grandiosity to their relationship. Additionally, the 'clash of ideals' trope is often used. Gilgamesh's self - centered and somewhat hedonistic ideals might clash with Kirei's more conflicted moral compass, and this can create a lot of interesting plotlines as they either try to reconcile or go their separate ways.
I'm not aware of its popularity without more information. There are countless visual novels out there, and its popularity would depend on various factors like the quality of the story, the art, and the marketing.
There's a fanfiction called 'Kotomine and Shirou: United Front'. In this one, they are forced to team up against a common enemy that neither could face alone. The story delves deep into their relationship, starting from their initial distrust and gradually building towards a mutual respect and understanding. It's a great read for those who like character - development - focused fanfictions.
I'm not sure specifically as there could be many interpretations. It might be a visual novel related to a beautiful wife ('tsuma ga kirei' can mean'my wife is beautiful' in Japanese). Maybe it's a story that revolves around the relationship with a beautiful female character, perhaps including elements like love, family, or daily life in a fictional setting.
When looking at the battle between Shirou and Kotomine in the visual novel, we need to consider their character development up to that point. Shirou has grown through his experiences and his relationships with other characters. This growth affects how he approaches the fight. Kotomine, with his long - standing plans and knowledge, presents a formidable opponent. Shirou's tenacity and the power he has acquired through his journey are crucial in this battle. The battle is also a display of the visual novel's complex storytelling, as it ties in with the overall themes of the story, such as the nature of heroism and sacrifice.
In this fanfiction, it could start with an experiment in the magical research of both universes. Harry Potter, while exploring new magic, accidentally creates a portal to the world of Kotomine. Finding the young Kotomine in a difficult situation, Harry decides to stay and help him. As time passes, Harry imparts his knowledge of friendship, love, and the power of good magic to Kotomine. Their relationship grows, and they face various threats together, including enemies from both the Harry Potter and Fate universes who see their relationship as a threat to the established order. Harry's role as a father figure would be central to Kotomine's development, and they would embark on a journey of self - discovery and adventure.
The popularity of Kotomine Shirou crossover fanfiction lies in the contrast between the two characters. Kotomine is often seen as a complex and morally ambiguous character, while Shirou is more of an idealist. When they are brought together in a crossover, it creates a lot of interesting dynamics that fans love to explore.
A common concept is a power - up or alternate power - set for both characters in the crossover. Shirou might gain some of Kotomine's knowledge of the Grail or his combat skills, while Kotomine could inherit Shirou's ability to project weapons in a new and unexpected way. This could change the power dynamics in battles and the overall plot of the fanfiction.