What are some popular 'Reincarnated as an Animal' light novels?

One popular one is 'Reincarnated as a Slime'. It features a unique take on the theme with interesting plot developments.

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.

A well - known'reincarnated as an animal novel' is 'Mrs. Frisby and the Rats of NIMH'. In this story, Mrs. Frisby, a mouse, has to deal with the challenges of protecting her family. The rats in the story were part of an experiment and have gained intelligence. Another example is 'The Jungle Book' by Rudyard Kipling, which shows the life of Mowgli, a human boy raised by wolves in the jungle among other animals.

Some popular ones include 'That Time I Got Reincarnated as a Slime'. It has an interesting premise where the protagonist is reincarnated in a fantasy world as a slime and gradually builds his own power and community. Another is 'Re:Zero − Starting Life in Another World', which is known for its complex plot and character development as the main character keeps dying and restarting his life in the new world.

One popular one could be about a person reincarnated as a cat in a magical world. The cat discovers it has special powers and gets involved in all sorts of adventures, like helping other animals against an evil wizard. Another might be about reincarnation as a wolf in a post - apocalyptic world where packs are at war. There's also the idea of being reincarnated as a dragon in a medieval - like fantasy setting, hoarding treasure and having epic battles.

There's also 'I'm a Spider, So What?'. In this novel, the main character is reincarnated as a spider in a dungeon. She has to struggle to survive in this harsh new environment, using her wits and the skills she develops over time. It has an interesting take on the reincarnation concept as we see the world from the perspective of a spider.

'So I'm a Spider, So What?' features a girl who is reincarnated as a spider in a dungeon. It's different from the typical reincarnated as a baby in a human form but still has that sense of starting anew in a strange world. The spider has to fight for survival and gradually becomes very powerful, and the story shows her growth in this new and dangerous environment.

One popular 'Reincarnated as a Monster' light novel is 'Reincarnated as a Dragon's Egg - Let's Aim to Be the Strongest'. It follows the story of a protagonist who is reincarnated as a dragon egg and has to navigate a world full of challenges and grow stronger. Another one could be 'So I'm a Spider, So What?', where the main character is reincarnated as a spider in a dungeon. The story focuses on her survival and evolution in this new and dangerous form.

I'm not sure if it's extremely popular. It's a rather unique and strange concept for a light novel, and it might not have the mainstream appeal that more common themes like fantasy adventures or romances have.

One popular one is 'The Gamer's Animal Reincarnation Adventure'. In this story, a gamer wakes up in the body of a fox in a magical forest. He has to use his gaming skills to survive, like his knowledge of strategy to find food and avoid predators. Another is 'Reincarnated Gamer as a Cat', where the protagonist, a cat, uses his gamer instincts to become the most feared feline in the neighborhood, outsmarting other animals.