It seems like I spend so much time thinking about the good guys as I write my novels that I forget the bad guy needs love too. Plot lines revolve around conflict. Therefore, there must be a source behind that conflict, and that would be the antagonist. More commonly known as the villain.
There are different approaches to creating a villain. One is to have him or her truly evil and completely irredeemable. Think Count Dracula. Your readers will hate him and root for the good guys to wipe him out. This is the villain you can kill off at the end of the story, and leave your readers feeling relieved and satisfied.
A more interesting approach is to create a conflicted villain. Instead of Count Dracula, you have Barnabas Collins, the reluctant vampire from Dark Shadows. Barnabas had been a good guy until a witch placed a vampire curse him. This leaves him despising what he’s become. I think of Barnabas as a “hero-villain.” He’s an antagonist we can root for. We want to see him cured of his affliction and end up with the girl. In the interim, however, he’ll wreak plenty of havoc.
Some storytellers like to take chances and have their hero go bad. Interesting approach, but it can be tricky. If you’re going to attempt it, your character will need plenty of redeeming qualities. If not, your readers won’t make a connection, and they won’t root for him or her. By the end of the story he or she will have to renounce all the bad things they did earlier. They must also be willing to make up for the sins of the past. If not, your readers won’t be satisfied with the ending, assuming they stay with your story until the end.
Another way to conclude your story would be to end a tragedy with a tragedy. This works well when your villain has done things that simply can’t be walked away from. At the end of the original Star Wars saga, Darth Vader renounces the emperor and turns away from the dark side of the force. In doing so, he has to sacrifice his own life in order to save Luke. This made a dramatic, and satisfying, end of the conflict.
So there you have it. With a little imagination, and a few character quirks, you can create interesting and memorable villains who’ll keep your readers engaged. And that’s what good storytelling is all about.