Colonel Dugan is the main antagonst of The Next Karate Kid. He's the instructor of the Alpha Elite. He is portrayed by Michael Ironside.
Based on his brief history, he was a real colonel before he applied for his position at the high school. He used what he learned in the army on his students and tried to force more serious techniques on them. Towards the end of the movie, he tries to force his students to kill one of their peers, one of his former students no less.
As mentioned earlier, he was a part of the army, which means he had developed a cold and serious demeanor. He's very authorative and strict when it comes to a student disobeying him or getting in trouble.