Board Thread:Fun and Games/@comment-2175012-20171205173216/@comment-3364901-20171205185254

also I'll add that it is often a much better story if you show a good character slowly becoming a villain, you watch them progress from protagonist to antagonist in an arc.. you grow to understand them more and what motivates them.. that is a much better way to do things than "surprise, I was bad all along".

instead of having the guy who acts nice for the majority of the film suddenly be revealed as some mastermind behind the scenes have them legit start as a friend or ally, then show events in film slowly drifting them into conflict with the other protagonist(s) - then if they turn "bad" at the end you can see why.. you can understand why.. makes them much more memorable.

for example, let's say there is a war-film and we have two soldier buddies, they are geniune friends but events slowly start to eat away at them and one of them gets progressively more concerned about aspects of war and sees the enemy's views or ideals as making more sense, or they start to get more disheartened by their own side's habits or ideals.. the two get separated or something, one gets captured (or even just disappears).. then the captured (or missing in action) soldier is revealed near the end, having joined the enemy or something because they have grown to hate the group they were with and sympathized with the enemy.. much better reveal and reason (even if you know who it will be, there's at least a reason the "former good guy" became a "end boss" style confrontation).