The creativity in the storytelling. Writers can create all kinds of scenarios for the transformation. It could be due to magic, like a magical potion that causes the animal to gain weight. Or it could be a result of a strange environmental factor. And then there are the different personalities of the animals. A normally proud and elegant swan becoming a fat swan and how it copes with its new self is a great source of entertainment and makes these stories really appealing.
The uniqueness. These stories often take normal, skinny animals and transform them into something completely different - fat animals. It's a fresh concept that catches the reader's attention.
One reason is the sense of adventure. In stories like 'Tarzan' where there are many animal encounters, it adds an exciting element. Also, the relationships between animals can be really touching. In 'Bambi', the friendship between Bambi and Thumper is very sweet. Moreover, great animal stories can make us more aware of nature and the importance of protecting animals.
The characters. Animals in these stories often have human - like qualities which make them relatable. For example, in 'Charlotte's Web', Charlotte is kind and intelligent, just like a good human friend would be.
The concept of transformation is really exciting. Fans love to see how Charizard can change and grow in different ways in these fanfics.
The simplicity of the stories makes them appealing. In a cute animal story, it's often about basic emotions like love, fear, or joy. For example, a puppy finding its favorite toy after losing it is a simple joy that we can all relate to.
The fear of the unknown. In animal horror novels, animals often behave in unexpected and terrifying ways. For example, in 'Cujo', a dog we usually consider friendly becomes a killer. It plays on our basic trust of animals and turns it on its head. This contrast between our normal perception of animals and their new, menacing roles creates a strong sense of horror.
Well, in the TF2 universe, they are both very different yet equally important classes. In fanfiction, writers can explore what would happen if they were forced to work together closely. Maybe they start off hating each other but then find common ground. Also, the potential for a romantic or at least a very strong platonic relationship is there, with all the secrecy and danger around them adding spice to the story.
The characters are very appealing. Uncle Wiggily himself is a lovable hare with his long ears and walking stick. The other animal characters like squirrels, rabbits and owls are also very cute and relatable for kids.
They usually have cute and comical animal characters. The situations and interactions between the animals and the doctor can be hilarious.
The character development. In 'Reincarnated as a Slime', the slime protagonist starts from being a weak creature and gradually becomes a powerful and respected leader. We see his growth in terms of power, knowledge, and relationships, which is very engaging.
The uniqueness of Wolfgang's character. He's big and strong - looking, which gives a lot of room for interesting storylines.