Whether you craft detailed character profiles or you let the character take you on their journey, it is helpful to really KNOW your character’s personality. By understanding the inner core of your characters, you understand their personalities, motivations, and how they will react to conflict and to each other. There are several books that make your job easier.
Writer’s Guide to Character Traits by Dr. Linda Edelstein
From Sex to Schizophrenia: Everything you need to develop your characters! As a psychology-based book for writers, this is an excellent addition for your reference library. With insightful summaries, you can dig deep into motivation and conflict, and create complex characters that readers love.
45 Master Characters: Mythic Models for Creating Original Characters by Victoria Lynn Schmidt
This book explores the common male and female archetypes that have been used in story-telling for centuries. This gives you ideas for traits, habits, hidden secrets, desires and greatest fears as a foundation for creating compelling characters and storylines. Dig deep and ask why. This will help you understand your characters’ motivation, making them intriguing and realistic. And added bonus are the examples for each archetype drawn from literature, television and movies. This is a great book.