Macbeth is a dynamic character :he changes as he begins tasting power and murdering people. Macbeth starts out with low self-esteem. He lets his wife manipulate him. He is very indecisive and cannot make up his mind about killing the king. Macbeth is probably the least emotionally equipped person to handle killing a king. He is really at the mercy of his wife's ambitions to be queen. As he tastes power, he cannot stop killing people to make himself feel secure. Eventually his lust for power and his bloody ambition is his undoing.