The main characters would include the titular evil young lady. She is likely to be complex, with reasons behind her evil behavior. Then, there might be a hero - type character who tries to tame her. He could be a nobleman or a commoner with a strong will. Additionally, there could be a villain in the story who either wants to keep the young lady evil or has his own motives against the taming process. Her friends or confidantes, if she has any, would also be important characters as they can influence her actions and decisions.
One of the main themes could be redemption. The 'evil' young lady might go through a journey of self - discovery and change. Another theme could be love, as someone might be trying to tame her through love and understanding. Also, power dynamics could play a role, perhaps she is evil due to a struggle for power and the process of taming her is about rebalancing that power.
The main characters might include a young outcast who feels marginalized by society and turns to 'evil' ways as a form of retaliation. There could also be a young idealist who initially tries to stop the 'evil' but gets drawn into it somehow. And there may be a character who is a victim of the young and evil ones, whose story drives the plot forward in terms of showing the consequences of their actions.
The main characters are, of course, the evil lady and the hero. The evil lady could be a character with a troubled past that has led her to be seen as 'evil'. The hero might be a character with noble qualities, like courage and justice. Their interactions will form the core of the story, as they are likely to be in conflict and also potentially in a relationship of some sort.
As the title only gives us two main elements - the evil lady and the hero - it's likely they are the central characters. However, there might be a mentor figure for the hero, or perhaps some friends or foes of the evil lady. For example, if it's a fantasy setting, there could be a wizard who guides the hero, or a group of minions that the evil lady commands. But without reading it, we can only guess at these potential characters.
There could be some regular customers in the royal shop who are also important characters. For example, a nobleman who always gives valuable feedback or a mysterious traveler who brings in new ideas from far - away lands. And of course, there might be her employees, if she has any, who play important roles in the daily operation of the shop.
Since I haven't delved into 'Taming Master Light Novel', I'm unable to name the main characters. However, in light novels, the main character often has some unique traits or abilities. There could be a main character in this novel who is an expert in taming or is on a journey to become one. And there may be other important characters around them, such as those who help or oppose the main character in their taming - related endeavors.
Since we don't have much information about this 'taming master web novel', it's difficult to say exactly who the main characters are. However, it's likely that the taming master is a central figure. There might also be antagonists who oppose the taming master's goals, like other tamers who are jealous or have different motives. And there could be some side characters such as the local villagers or merchants who interact with the taming master during their adventures.
Mr Black is obviously a main character in 'Taming Mr Black' novel. There could be other important characters like his family members who play a role in his life and might be related to the taming aspect. Maybe there is a mentor - like figure who tries to guide Mr Black in the right direction, or a rival who makes the taming process more difficult. Without reading the book, it's hard to be certain, but these are common types of characters that could be present.
Since I haven't read the novel, I can't say for sure. But typically, there would be the possessive girl herself and probably a male lead who has to deal with her possessiveness.
The protagonist is usually the one who attempts to tame the villainess. And of course, the villainess herself is a main character. There may also be side characters like friends or family members of the two main characters who play important roles in the story.