Are there any completed novels that describe the protagonist from another world, anime world, etc.?

Yes, I recommend the following completed novels: 1. "Transformed Nine-Tailed Fox Fairy: The otaku transmigrated into a nine-tailed fox, transmigrated into various anime worlds, and became a strong individual." 2. "The Strongest Animation System": The otaku transmigrated to the body of a good-for-nothing from another world. Relying on his familiarity with various animations in his previous life, he possessed an invincible animation system and became the strongest. 3. "Naruto: Ghost Sword Susa": The story of passing through the Naruto Uchiha clan and possessing the four profession skills of Ghost Sword. The protagonist spreads the glory of poisoned milk powder to the anime world. I hope you like my recommendation. Muah ~