As I haven't had the chance to read this light novel, it's difficult to name all the main characters accurately. But from the title, we can assume that the two central characters are the angel, who is characterized as 'oroka' (foolish or naive), and the devil. There may be other important characters that are introduced as the story progresses, perhaps other angels or devils, or humans that get caught in the middle of the relationship between the main angel and devil characters.
Since I haven't read it, I can't say for sure. But based on the title, the main characters are likely to be the 'oroka na tenshi' (the naive angel) and the 'akuma' (the devil).
Chapter 576, "The Electronic Pickles are Gone!", is the clearest early answer because it turns Let's situation into a concrete plot event. The chapter gives readers a real answer by opening on Tonight, Team Q exceptionally didn't cook.
Chapter 725, "Still Want to be the Second Young Master of the Jiang Family!", is the clearest early answer because it turns Jiang Zhao Yuan's situation into a concrete plot event.
Chapter 466, "Are There Really Wild Boars?!", is the clearest early answer because it turns Lingzhi's situation into a concrete plot event. Early on, The lady sure acts like a lady, even in 'Wilderness Survival' she....
Chapter 422, "The Watch Was a Gift from Him", is the clearest early answer because it turns Nina's situation into a concrete plot event. It opens with Seeing that no voice came from the watch to stop them, the captain of...
Chapter 322, "Water Breaks Heaven's Heart", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. A useful checkpoint is the way the scene starts with This character is great!" Tang Yuli was also very happy, "It just so...
Chapter 671, "Who Understands Family!", is the clearest early answer because it turns Jingcheng Airport's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Director Meng drove the shuttle bus around Jingcheng Airport.
Chapter 481, "She Actively Pursued the Boss", is the clearest early answer because it turns Director Zheng's situation into a concrete plot event. Early on, Bai Lu ultimately couldn't exchange for 500 points.. By the end, Lili, what do you need these items for?" Jiang Li took out one of the....
Chapter 336, "He's Just a Charlatan!", is the clearest early answer because it turns Li's situation into a concrete plot event. The setup is Lady He kept mocking with relentless sarcasm., but the pressure keeps building through Seeing Jiang Li's face made her angry..
Chapter 470, "Why Talk About Pigs When Looking at Him?", is the clearest early answer because it turns Demon Mountain's situation into a concrete plot event.
Chapter 872, "Got Goosebumps in Broad Daylight", is the clearest early answer because it turns Wan Jia's situation into a concrete plot event. A useful checkpoint is the way the scene starts with My master has been in seclusion for some time.