Well, in Twilight fanfic, Jacob could be larger than Emmett in different ways. It could be that his werewolf abilities allow him to have a larger presence. When he transforms, he might have a greater mass or a more imposing figure. Emmett, on the other hand, is a vampire with his own set of characteristics, but perhaps in these fanfictions, the author emphasizes Jacob's size advantage, whether it's in terms of his physical strength manifestation or just the sheer size of his werewolf form.
In some Twilight fanfictions, Jacob's werewolf form might be described as larger in terms of physical stature compared to Emmett's vampire form. Maybe it's about his height, or his overall build when transformed. For example, his werewolf shape could be more bulky and take up more space, while Emmett, though strong as a vampire, might be more streamlined in comparison.
Jacob being larger than Emmett in Twilight fanfiction could be due to multiple factors. The werewolf gene in Jacob might lead to a larger physical form when he shifts. This could be in contrast to Emmett's vampire physique which, while strong and athletic, may not be as large. Some fanfic authors might also play with the idea of Jacob's 'largeness' in a more metaphorical sense, like his role in the story being more significant or his personality being more 'big' in a way that overshadows Emmett, but physically, it could be that his werewolf form is just bigger, taller, and broader.
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