Their relationship was complex. There was rivalry between them mainly because of Jacob's deceitful actions. But over time, as the story progresses, there was also a form of reconciliation when Esau forgave Jacob.
A dominant Jacob is usually in touch with his alpha side. This means he has a natural leadership quality. He can command respect from others in the fanfiction world. And when it comes to Bella, this leadership translates into him guiding their relationship in a way that he believes is best for both of them. He may be more confident and self - assured, which can be both appealing and a source of conflict in the relationship with Bella.
In these fanfictions, Jacob often retains his loyalty, which is a big part of his character. He's extremely loyal to his pack and to the person he loves. For example, in many stories, he'll go to great lengths to protect his love interest from any danger, whether it's from other supernatural beings or just regular human problems.
Well, Jacob deceived Esau in two main ways. Firstly, he exploited Esau's hunger. Esau was so hungry that he was willing to trade his birthright, which was a very important thing in their culture, for a simple bowl of stew. Then, to get the blessing, Jacob followed his mother's plan. He disguised himself as Esau. He wore Esau's clothes, which would have had Esau's scent on them, something that their blind father Isaac could recognize. And he used goatskins to make his skin feel hairy like Esau's. This way, he managed to deceive Isaac into giving him the blessing that was rightfully Esau's.