Answer:
Protagonist - the central character who has to overcome the main conflict in the story.
Antagonist - The character who opposes the lead character and is the main source of conflict.
Secondary character - The character with ordinary qualities providing support to important characters
Step-by-step explanation:
Stories need different kinds of characters in order to be cohesive and complete, the three most important ones are protagonist, antagonist, and secondary character, the stories tell the events the protagonist has to pass through and it is because of the antagonist that they have to deal with many external conflicts, all protagonists have a sidekick who is the one called secondary character.