I'm probably a bit in over my head here but I'm interested in jumping straight into fiction writing. The issue I've ran into in the past is that I can never settle on what characters I want or what their history and personalities should be. I tend to keep such details in a state of flux and it destroys the backbone of anything that would resemble a plot. Being a bit of a perfectionist probably doesn't help my situation either. When does one put the stamp on a character? Should they still be tweaked during plot creation? If so, then to what extent? Or should a character's history and personality be determined before any plot writing begins. Are there cases when the process of character and plot creation are intertwined? Does it depend on the importance of the character?