Answer:
a character with a complex and realistic personality
a character whose actions advance the plot
Explanation:
Major characters can have different features, but in general, this type of character exhibits a complex and realistic personality, with a depth of feelings and passions, and usually having contradicting or inconsistent behaviors. Furthermore, major characters usually go through a major change in a specific point in the story or change gradually during the course of the story. Either way, it is the main character's actions which advance the plot.
