According to Stephenie Meyer, Jacob was originally meant to simply be a device through which Bella could learn Edward's secret in Twilight. However, Meyer, her agent, and her editor all liked the character so much that they decided to give him a larger role in the following book, New Moon, with Meyer calling the character, "my favorite gift that New Moon gave to me."
"Jacob was my first experience with a character taking overa minor character developing such roundness and life that I couldn't keep him locked inside a tiny role....From the very beginning, even when Jacob only appeared in chapter six of Twilight, he was so alive. I liked him. More than I should for such a small part."
Meyer has said that after Jacob started emerging as a prominent character in New Moon, she went back to Twilight, which she was editing at the time, to "weave Jacob and his father Billy throughout Twilight more centrally."
And rlly? Well, I do understand that, Jacob i insanely amazing and loveable! I'm glad she gave him a bigger role cuz' without him, New Moon would be nothing! (literaly!) I HEART JACOB!
EEEE! yes he is! The second time I read New Moon I couldn't put it down! I can't wait for the movie! He's gunna show alotttt of skin! I'm happy he's going to have his shirt off for a long time :)