During childhood, he and his sisters, Rachel and Rebecca were sometimes acquainted with Charlie Swan's daughter, Bella, though they never became real friends and Bella remained mostly in California and Phoenix. All three attended school on the La Push reservation. Throughout childhood and adolescence, Jacob's two best friends were Embry Call and Quil Ateara V. Jacob Black was born to Billy and Sarah Black. ' We used to make mud-pies when we were little.' ―Jacob, to Bella. He is portrayed by Taylor Lautner in the movie adaptations. His Life and Death counterpart is Julie Black. Jacob subsequently imprints on Bella and Edward's daughter, Renesmee, thus freeing himself from his heartbreak and triangular issues with Bella and Edward. He forms a deep bond with Bella in the sequels and tries to fight against Edward for her love until she realizes that her love for Edward is stronger and chooses him over Jacob. On Stephenie Meyer's official website, Jacob was originally just a device to inform Bella about the 'Cold Ones.' However, both she and her editor liked Jacob so much that they decided to give him a larger role in the sequels to Twilight, making him a main character in New Moon, Eclipse, and Breaking Dawn. In Breaking Dawn, he imprints on the hybrid baby named Renesmee Cullen, the daughter of Edward Cullen and Bella Swan.

In Twilight, he is fifteen years old, and in New Moon, he phases into a wolf for the first time at the age of sixteen. Jacob Black is a shape-shifter or 'werewolf' of the Quileute tribe, former Beta of the Uley pack, and Alpha of his own. But now he really is a Cullen.' ―Taylor Lautner on his character.

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