Perhaps there's a female lead who is not afraid of the death mage and instead sees his potential for good. Her character could bring out different sides of the death mage. Also, there could be an antagonist who is another powerful mage but uses his powers in a more traditional and perhaps more cruel way, which would create an interesting contrast.
There could be a group of outcasts that the death mage befriends. Each member of this group has their own unique backstory and abilities. They might have been rejected by society for various reasons, and together with the death mage, they form a sort of misfit family. Their interactions and how they support each other would make them all very interesting characters.
I think Near is one of the most interesting characters. He has his own way of thinking and investigating, and he enters the fray at a crucial point in the story. He is different from L but still manages to be a formidable opponent. Then there's Matsuda, who is a bit of an underdog among the group. His more naive and emotional reactions compared to the other highly intelligent characters provide a different perspective in the complex world of 'Death Note Light Novel'.
I'm not sure specifically as I haven't read the exact 'death mage light novel'. But usually, the main character would be the death mage himself. There might also be a mentor figure who teaches him about his powers at the start, or a sidekick who helps him in his adventures.
Light Yagami is a very complex character. At first, he seems like a normal, intelligent student, but then he becomes this power - hungry and somewhat evil figure. L is another great character. He has this strange appearance and behavior, but his mind is extremely sharp. Ryuk, the Shinigami, is interesting too. He drops the Death Note into the human world just for fun and then watches the chaos unfold.
The leader of the death squad is often an interesting character. They usually have a complex personality, being both feared and respected by the squad members. Their decisions can shape the entire story. Another interesting character could be the new recruit. They bring a fresh perspective and often have to adapt quickly to the harsh reality of the death squad.
Jacqueline de Bellefort is an engaging character. Her love - turned - to - jealousy relationship with Simon Doyle and her actions throughout the story add a lot of drama. She is a character full of passion and determination, which makes her actions unpredictable at times.
I'm not sure exactly as I haven't read it in detail. But there's probably the death mage himself as a main character.
I'm not sure exactly as I haven't read it. But it could have the death mage as a main character. There might also be his friends or allies who support him in his journey, like a brave warrior or a wise wizard.
The black mage himself is probably one of the most interesting characters. His motives, his past, and his powers all make him a complex figure. He may not be a typical hero, but his actions and decisions drive the story in many ways.
Perhaps there is an old wise character in the 'death is only the ending for the villainess novel'. This character could be like a mentor to the villainess, guiding her with their wisdom on how to avoid her death. And also, there might be a group of characters who are part of a secret society or something, and their interactions with the villainess add more layers to the story and make them interesting.
Mello is quite an interesting character. His determination and his somewhat unorthodox methods make him stand out. He is willing to take risks and use his intelligence in creative ways to achieve his goals related to the Death Note.