The following novels all had a protagonist with a system: "The God of Douluo: The King's Arrival","The Big Boss from the Big Boss Village","My System Is All Composed","The Manga System","The Card System: A Dream of the Great Tang","Simple Mission System","Total System War","Magical Equipment supplier","The Mother Empress System: The Thousand Foundation Transformation","The Author's Training Diary","Do You Know Naruto","The Invincible Protagonist Terminator System","God-level System: I'm the Big Boss Villain "," From Orphan to Emperor ". I hope you like this fairy's recommendation. Muah ~๐