Character Development

Character Development is how an Author gives a character it way of being. The character is made to make you feel something towards him. The author shows his attitude to show you how you should feel towards the Character. If for example the Author wants you to show respect to the author. To show that the character should show the character elements like: his best friend, worst enemy, ambition, etc. The idea of the author is to show what the character feels and acts.
Elements Plot:
Element Plot is what the Author does to make a story mood and tone snd changes some details. As an example If the author starts talking about his family been lost in a fire(Series of Unfortunated Events ) you have the clue that the story is not going to be a happy story, also it shows that the tone of the book/story will be sad.