The Negative Trait Thesaurus: A Writer's Guide to Character Flaws by Angela Ackerman &  Becca Puglisi is another great book in the Thesaurus series.  As the subtitle tells you, this book focuses on character flaws.  Like the other books in the series, the book gives a lot of details around different flaws and common interactions and conflicts that result from those flaws.  This book is very helpful for adding depth to characters you are writing.  Another one to have in your library if you are interested in growing your writing skills.