I can recommend a novel in which the protagonist is the Great Demon King. The story background is that the world has obtained a system, and the protagonist can constantly switch systems?

😋I recommend the sci-fi novel "The Strongest System: The Heavenly Bandits" to you. After the protagonist transmigrated to the Heavens, he received many sub-systems, such as the martial arts system, the enlightenment system, the summoning system, and so on, which helped him become a peak bandit. I hope you like this fairy's recommendation. Muah ~😗

I recommend the following novels to you ~ "I'm Here to Robb Again" was a fantasy romance novel. The main character was a free and unfettered loose immortal. After he mistakenly entered the demon race, he encountered many setbacks, but he also experienced growth and love. "Thirty Years of the Demon Clan's Registration, I'm Invincible in the World" was also a fantasy novel. The protagonist, Lin Yu, activated the registration system while he was imprisoned by the Demon Clan. He obtained countless treasures and eventually became an invincible existence. "Top Grade Demons in the City" was a novel about urban special abilities. The main character, Cheng Yi, was the son of a demon king. He was full of dominance and thrills. I hope you like this fairy's recommendation. Muah ~😗

I recommend the novel " Divine Protagonist System " to you. This is a fantasy-Eastern fantasy novel. The main character Chu Bai had transmigrated to another world and obtained the main character system. He was enjoying a happy life, flirting with girls and showing off. At the same time, he used the Nine Swords Beyond the Swords to challenge the Sword Saint, stole his own family's treasure vault, and even eloped with a princess. If you like stories about transmigrating to another world with a system, this novel is definitely not to be missed. I hope you like my recommendation.

Hehe, I heard that you're looking for a magic novel with a transmigration male lead. No problem! I recommend Special Forces: I, Fan Tianlei, Cry in Anger at the Beginning. The male protagonist of this military novel transmigrated into the world of special forces, obtained the Billion Point Skill Sign In System, and gradually became a sharp blade in the army. The eighth demon king of the demon world did not seem to be the main theme of this book. However, I believe that the plot and magic system of this novel will satisfy your appetite. I hope you will like this fairy's recommendation.😗

The female protagonist of the novel "The Female Lead of the Quick Dress Up Only Wants to Level Up" was named White Snow. She had obtained the Quick Dress Up System. I recommend this novel to you. The style of the novel is fresh and the plot is interesting. The female protagonist is anti-routine, and the space-time travel adds some mystery and imagination. I hope you like this fairy's recommendation. Muah ~😗

I recommend "I Have Countless God-level Backgrounds" and "Pushing All the Way From the Beginning" to you. The protagonists of these two novels had powerful backgrounds and special skills. They were invincible from the beginning. I hope you like this fairy's recommendation. Muah ~😗

I recommend you to read the two novels," Pulling a Demon King to Make a Counterattack " and " I'm a Demon King in the Other World." They were all original fantasy novels with the Demon King as the main character. They had a grand worldview and special settings. There were also some similarities with the Monster Farm in the Other World. I hope you like my recommendation.

I recommend the ❮ Heavenly Tribulation Lightning Master ❯ to you! The protagonist of this fantasy novel obtained the power of the King of Gods and the Demon King. He cultivated the strongest cultivation technique and possessed power that he did not even have in his previous life. He became the supreme King of Gods and stepped into the realm above the King of Gods. If you like a strong protagonist and thrilling plots, this book is definitely worth reading. I hope you like my recommendation. Muah ~

I recommend "My System Is All Compiled", a sci-fi novel about apocalyptic crisis. The protagonist gets a blank system with no functions, but the system forces him to do missions. If you like this kind of theme, you can try reading this novel. I hope you like this fairy's recommendation. Muah ~😗

The following are some recommendations for novels with the female protagonist having the King System: 1. " Crossing with the Possession System ": This novel tells the story of the female protagonist possessing the King of Glory system. The title is " Crossing with the Possession System ". It is said to have a novel theme and is very interesting. 2. [King System: Show off from Diao Chan]: This novel was a game-game system novel. The protagonist activated the King of Glory system in the foreign world invaded by the gray fog and drew the hero Diao Chan. 3. " The Top Female Streamer of Mobile Legends ": This is a fantasy romance novel. The story is about a dead otaku Bei Nan who transmigrated to a world with a streamer system. In order to face the threat of death from the system, she could only choose to become a Mobile Legends streamer. Please note that the novels recommended above are based on the search results provided. The specific content and quality may require further inspection and understanding.