Some popular ones might include those that expand on the unique world - building of the BNA universe, with detailed stories about the different animal - human hybrids. For example, there could be novels that focus on the backstories of the main characters, their struggles in a world where they are different. However, without more specific information, it's hard to name exact popular titles.
You can try looking for them in specialized bookstores that carry a wide range of light novels. Some large chain bookstores might also have them in their manga or light novel section.
Since it's a brand new animal novel, it could be exploring the concept of animals in a whole new light. It might combine elements of fantasy and reality. Maybe the animals in the novel have special powers or abilities that are unique to them. It could also be about the bond between humans and animals if there are human characters involved. The story could take place in a completely made - up world filled with these amazing animals, or it could be set in a more familiar, but still somewhat altered, real - world environment.
Well, Shirou in crossover fanfiction often shows his tenacity. No matter how strange or difficult the new world he is in, he doesn't give up easily. In a crossover with the Digimon world, he faces many challenges but keeps fighting. His loyalty is also a big part of his character. If he makes friends in the new world, he will be loyal to them and protect them at all costs. And his growth as a character is interesting. He may start with his basic set of skills from his original world, but as he experiences new things in the crossover world, he evolves, both in terms of his combat abilities and his understanding of different cultures and values.
Well, if this fanfic focuses on all the Shirous meeting under the snow, it might be a great opportunity to see how their different personalities interact. Some Shirous could be more battle - hardened, while others might be more idealistic. The snow setting could add a sense of purity and isolation, enhancing the drama and the significance of their oath. It could also be a chance to explore how their different fates led them to this moment.
His character might become more confident. With unlimited mana, he'd be able to face challenges without hesitation. He'd no longer have to hold back due to mana constraints.