You might want to check out 'Bible Black'. It offers a somewhat complex story within the adult anime genre. But be aware that this kind of anime is targeted at a specific audience and may not be everyone's cup of tea.
Yes, Spice and Wolf is quite popular for fanfiction. The anime has a rich world with interesting characters like Holo the wolf deity and Lawrence the merchant. Their unique relationship and the medieval - like setting provide a lot of material for fans to create their own stories.
There is a wolf anime story where a wolf is raised by humans. This wolf, named Akira, has a special bond with a young girl in the village. However, as Akira grows older, his wolf instincts start to surface more strongly. The villagers become afraid, but the girl tries to protect Akira. It's a story of friendship, fear, and the struggle between human and animal nature.
Well, it could be a result of jealousy, revenge, or maybe he was forced into it by external circumstances. Without more details, it's hard to say exactly.
Another great one is 'Spice and Wolf'. The story follows a traveling merchant and a wolf deity named Holo. It combines elements of economics, travel, and a unique relationship between the two main characters. There are many interesting cultural and historical references in the story as well.
The wolf characters usually have a sense of mystery. In 'Spice and Wolf', Holo is a wolf deity, and her powers and knowledge make her a mysterious figure. This mystery adds to the allure of the love story as the other character gradually discovers more about her.
There's also 'Okami - San and Her Seven Companions'. It features a girl who has wolf - like characteristics. The story is full of humor, school - life situations, and a bit of mystery as the characters interact and deal with various challenges in their school and personal lives.
One common theme is the struggle between nature and civilization. Wolves often represent the wild, and they may face challenges when interacting with human - made environments or cultures. Another theme is loyalty, within the wolf pack or towards other characters they befriend. For example, wolves will fight to protect their pack mates.