Well, without actually reading the novel, it's hard to say for sure. But likely, the main characters would be the wise women themselves. There could be one or more women who are the central focus of the story, perhaps with different personalities and areas of wisdom.
The main theme could be about the power and wisdom of women. It might explore how these wise women use their intelligence to overcome difficulties, make important decisions, and perhaps influence the world around them.
Since I don't know the exact 'the wise girl story', it's difficult to say. But surely the wise girl herself is a main character. There could also be her family members, like her parents or siblings, or perhaps friends or a mentor who helps her develop her wisdom.
I don't know for sure without reading the story. But I would assume the 'wise children' are the main characters.
The main character is obviously the wise king. There may also be his advisers, who help him in making decisions and offer different perspectives.
In most 'Percy is wise' fanfictions, Percy is central. His character development towards being wise is the focus. Other characters often include Grover, his satyr friend. Grover might rely on Percy's wisdom more than ever. Then there are the minor characters like the various nymphs and demigods who interact with Percy and are affected by his wise decisions.
In the 'wise mans grandchild web novel', the central figure is the protagonist who has been reborn in this new world as the grandson of a wise man. He is the driving force behind most of the story's events. Then there are characters around him. There could be a mentor - like figure, perhaps an old wizard who further guides his magical studies. His friends, who might be other students at the magic academy or adventurers he meets on his quests. And there are bound to be villains, like power - hungry nobles or dark magic users who try to disrupt the peace and development that the main character is aiming for in this new world.
There's Shin, who is the protagonist in 'wise mans grandchild light novel'. He has his own set of skills and knowledge from his past life. Then there's Merlin, the wise grandfather figure. There are also Shin's friends at the academy, like Sizilien and others. Sizilien is a female character who has her own charm and abilities, and she becomes an important part of Shin's circle.
The main character is at the center. He has his grandfather, the wise man. Then there are characters he meets at the magic academy. Some of them are friendly and support him in his adventures and his attempts to blend modern knowledge with magic. Others are jealous or threatened by his abilities and try to undermine him. There may also be important figures in the magical world's political or military scene that he has to interact with during his journey.
In the 'old and wise pumpkin story', the primary character is obviously the old and wise pumpkin. However, there might be supporting characters. For instance, there could be a little girl who discovers the pumpkin's wisdom. She might be curious about the pumpkin and start having conversations with it. There could also be some bugs or insects that are part of the pumpkin's world. Maybe a friendly ladybug that often perches on the pumpkin and listens to its tales of wisdom. Additionally, if it's a more complex story, there could be an antagonist, perhaps a mean old crow that tries to disrupt the peace of the pumpkin patch where the old and wise pumpkin resides.
The main characters are the wise old woman herself and the young lord or ruler who sets tasks for her.