The plot depends upon character plot with in turn depends upon character.
So, in a nutshell, characters make the story.
However, it depends upon what actual character plot you are dealing with as to what sort of character is required. To decide that, then ask what the character needs to achieve to be fulfilled in the book? Vengeance? Acceptance? Political power? A full body massage by a beatiful goddess? That decides something of your character - each of the achievements above would generally requier completely different characters/personalities.