Recommend some good reincarnated monster light novels.

There's 'In Another World with My Smartphone'. The protagonist is reincarnated with his smartphone in a fantasy world. While not strictly a monster reincarnation, he befriends various monsters and has adventures with them. It's unique because of the modern - day item (the smartphone) that he brings into the fantasy world and how it changes his and the monsters' lives.

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.

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.

Sure. 'That Time I Got Reincarnated as a Slime' is a very popular one. It follows the story of a man who is reincarnated as a slime in another world and gradually builds his own power and kingdom. Another great one is 'Re:Zero - Starting Life in Another World'. The protagonist has the ability to return by death, which makes the plot full of twists and turns.

Survival is a common theme. When the protagonist is reincarnated as a monster, they often have to fight for their lives in a world that may be hostile. For example, in 'So I'm a Spider, So What?', the spider has to constantly find food and avoid being killed. Another theme is growth. They usually start weak and gradually become stronger through various means like leveling up or evolving.

One of the things that makes these light novels appealing is the character development. When a character is reincarnated as a monster, they usually start from a very weak state. But as the story progresses, they learn new abilities, make allies, and grow in power. In 'Reincarnated as a Dragon's Egg - Let's Aim to Be the Strongest', the dragon starts small but gradually becomes a formidable force. Also, the world - building in these novels is often quite imaginative, with different ecosystems and races designed around the idea of a world where monsters exist.

One popular title is 'So I'm a Spider, So What?'. In this novel, the protagonist is reincarnated as a spider in a dungeon and has to survive and grow in a harsh new world. Another is 'That Time I Got Reincarnated as a Slime'. The main character is reborn as a slime and gradually builds a powerful nation of monsters.

One popular 'Reincarnated Princess' light novel is 'My Next Life as a Villainess: All Routes Lead to Doom!'. In this story, the protagonist is reincarnated as a villainess from an otome game. It has a great mix of comedy, romance, and a unique take on the isekai genre. Another is 'The Saint's Magic Power is Omnipotent'. The reincarnated princess here discovers she has powerful magic and has to navigate a new world where she is initially misjudged.

There is 'Kumo Desu ga, Nani ka?'. The spider - reincarnated protagonist evolves into a very powerful being, which has some elements related to the idea of becoming like a god. It has an interesting take on reincarnation and the growth of the character in a fantasy world.

Sure. 'Martial World' is a great one. The protagonist is reincarnated into a world of martial arts and has to climb the ladder of power. Another good one is 'A Record of Mortal's Cultivation to Immortality'. It follows the journey of an ordinary mortal who reincarnates and embarks on a path of cultivation filled with challenges and opportunities.