Caleb is hot-headed and temperamental. He has a tendency to turn to his anger instead of common sense.
The three drawing are from particularly points in his character development. The first one is his beginning look (though his eyes are supposed to be a blue shade.) Middle is after a majority of the story. And the last one is a natural middle in story progress...His hair goes from a bright shade of red(dye) to maroon before finally being left to its natural state.