Plan complicated quirks, flaws and weaknesses in your whole cast of fictional characters. But then make these quality have consequences. Santino, Sonny Corleone, the oldest son in The Godfather was impulsive and a hothead, but he was also a loving father and husband and believed in protecting women and children. When his pregnant sister Connie is beaten by Carlo her husband once again he rushes to her aid and paid for his tendencies with his life.

His impulsive interest in joining another crime family in selling drugs  during a meeting with his father is part of the first plot point and sets off a deadly chain of events.

Keep writing, keep dreaming, have heart