I’m getting into a fun territory, the realm of want/needs/desires of the character. Once you start exploring this aspect of a character, they quickly become more believeable. You can put them into a random scene and you should have some idea as to how they would behave.
I haven’t as yet completed a story, but I’ve had some real fun playing out some scenes with a character that popped into my head. Some of it is a bit stereotypical of that type of character, but it was still enjoyable to work through the scene.
The next task I think will be to populate the story with other developed characters. That should give the protagonist people to bounce off of, and possibly other avenues to drive the story. I guess I’ll have to dive in with both feet and see how things pan out.