There are likely to be other important characters such as the people who train the assassin, his targets, and perhaps some allies or friends he makes along the way. However, without reading the entire light novel in detail, it's hard to name every single main character.
I'm not entirely sure without reading it, but there's likely a main assassin character. Maybe there's also a mentor figure who trained the assassin.
I'm not sure exactly as I haven't read it, but likely the main character is the world's best assassin. There may also be characters like their mentors who trained them, or their targets that they are assigned to eliminate.
The central character is the reincarnated assassin. He is likely to be surrounded by various characters. There might be a female lead who he forms a bond with, either as a friend or something more. There could also be characters from his past life who somehow have a connection to his new existence, like an old rival who has also been reincarnated or an old master whose teachings still influence him in the new world.
There's also the people he meets in his new life. There's a girl who becomes his ally. She has some special abilities and she helps him understand the new world better. And there are some antagonists too. They are often those in power or with some dark motives who try to stop the main character from achieving his goals.
The main character, the reincarnated assassin, is the focal point. However, there may be a group of allies. For example, a group of adventurers who team up with the assassin. Each of these adventurers may have their own unique skills and personalities. There could also be a wise old wizard - type character who provides knowledge and guidance to the assassin throughout their journey in the new world.
The central character is the assassin. Alongside him, there could be some powerful villains who oppose him. And there might be some side characters such as a weapon smith who provides him with special weapons or a informant who gives him crucial information about his targets.
There could be side characters as well, like a mentor figure who taught the assassin their skills, or a love interest who adds a different dimension to the assassin's character, making the story more complex and engaging.
The main character is the assassin. He has exceptional skills and a mysterious past. His journey from being a top - notch assassin in his own world to facing new challenges in a different realm is the core of the story.
The main character is, of course, the world's finest assassin. He is highly skilled in his craft and has a complex personality.
In this novel, the reincarnated assassin is the central character. Alongside, there could be characters who are part of the new world order. For example, there might be a powerful noble who has an impact on the assassin's new life. There may also be other assassins or fighters who cross paths with the main character and either become friends or foes depending on the situation.