Final answer:
The main character of "A Sound of Thunder" by Ray Bradbury is Eckels.
Step-by-step explanation:
The main character in the short story "A Sound of Thunder" by Ray Bradbury is Eckels. The story revolves around a time travel expedition led by Travis, with Eckels being one of the participants. Eckels' actions during the expedition have significant consequences, making him the central character of the story.