The devil must be a main character as the title implies. There may also be other characters like angels or humans who interact with the devil in the context of its part - time role in the light novel. Maybe there's a boss - like figure who assigns the part - time job to the devil, or there could be a sidekick character who helps the devil in its part - time adventures.
Since I haven't read it, I can't say for sure. But it's likely that the devil is one of the main characters, given the title.
The main character is Satan Jacob. He is a devil who has to work part - time in the human world.
There is also Emi Yusa. She is an important character who has a complex relationship with Satan Jacob. Their interactions are quite interesting as they come from different 'worlds' so to speak, one being a devil and the other being an enemy of the devils in a way.
There is also a human character who befriends the devil. She helps him understand the ways of the human world. Her kindness and patience contrast with the devil's brash and sometimes clueless nature. Another important character is the devil's underling from the devil world who sometimes shows up in the human world and causes more chaos with his attempts to follow the devil's orders in a world he doesn't understand.
The main character is Satan. He is the devil who has to adapt to the human world and work part - time jobs.
The main characters include Satan Jacob. He is the devil who has to adapt to human life in Tokyo. Then there is Emilia, who is also from the devil's world and has her own agenda in the human world. Alciel is another important character, who is loyal to Satan and follows him to the human world. Chiho, a human girl, also plays a significant role as she gets involved with Satan and his group.
The Devil King is one of the main characters. He has to adapt to the human world and work part - time. There is also his female follower, who also plays an important role in the story as they navigate through the human world together.
The main character is the devil who has to work part - time. There are also probably some human characters he interacts with.
The devil is definitely one of the main characters. He has his own goals and motives, like trying to survive in the human world while still having his devilish nature. Then there's the girl who has a special connection with him. She might be a human, but she gets dragged into the devil's world in a way. And don't forget his workmates. They are there in the part - time job setting and add to the humor and the overall story. They might not be as powerful as the devil, but they are important for the story's development.
The main character is the devil. His name is Sadao Maou. His human form has a normal life in the human world, working at MgRonald's. Emilia, who is also from Ente Isla, is another important character. She has her own goals and her relationship with Sadao is complex. Chiho, a human girl who has a crush on Sadao, also plays a significant role in the story as she gets involved in the world of the devil and his friends.
Satan, also known as Maou Sadao in the human world, is a central figure. He's trying to take over the world but gets sidetracked by human life. Emi Yusa, or Emilia Justina in her true form, is a strong female character who opposes Satan. Alciel, whose real name is Shiro Ashiya, is always by Satan's side, and they have a lot of comical exchanges as they navigate the human world together.