This word means anything that happens to or is done by a character in a story.

The answer is event.

Explanation:

In a story, anything that happens to or is done by a character is called event. Events can change the direction of a story, the way characters are perceived by viewers or readers, the characters' being flat or complex... A story that has shallow events might be seen as boring. Events must be significant, otherwise the audience will see no reason to receive that information whatsoever and may even give up on the story for good.

i’m pretty sure it is the second