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.
Another way is through physical manifestations. In some fanfiction, Jacob's pain might be shown as a physical ache in his wolf form, like a constant throbbing that won't go away. Leah's pain could be shown as a sort of weariness in her eyes or a slump in her posture, indicating the emotional burden she carries day in and day out.
In the fanfiction, it can expand on the powers that Nessie has and how Jacob interacts with those powers. It might also add new characters that are related to their relationship, like friends or foes that are specifically interested in their union. This adds more layers to the story compared to the original where the focus was more spread out among different characters. Also, it can show more of the cultural aspects of the werewolves and vampires in relation to their relationship, which wasn't fully explored in the original Twilight story.
The imprint between Jacob and Leah can also change the relationships with other characters. For Bella, it might mean a different kind of friendship or interaction. Since Jacob was so involved with Bella before, this new development could shift the way Bella views Jacob and his place in her life. Also, it could affect how the Cullens view the wolves. If Jacob and Leah become a strong unit through the imprint, they might pose a different kind of threat or ally to the Cullens.
Often, their relationship becomes more complex. They might start off as just friends or comrades, but the pregnancy forces them to become closer, more like a family.
It would become more intense and complex. Jacob would be very protective, his werewolf instincts kicking in fully. He'd be constantly worried about Bella and the baby's safety.
Angela can be developed in relation to Jacob by facing some kind of internal conflict. For example, she might struggle with her feelings for Jacob because she knows he has a dangerous life as a werewolf. This conflict could drive her to either become more involved in his world to protect him or to distance herself, which would add depth to her character and their relationship.
Well, Jacob and Leah are both werewolves in the Twilight universe. Tears could be a sign of their emotional turmoil. Jacob might be crying because he is torn between his loyalty to his pack and his love for Bella. Leah, on the other hand, could be shedding tears because she has been through a lot, like being the only female werewolf and having to deal with the guys in the pack. Their tears could be a way to show their vulnerability and the complex emotions they are experiencing.
Many fanfictions look at their relationship from the perspective of loyalty. Jacob is loyal to the Cullens because of Renesmee. These stories often detail how their relationship grows as Jacob stands by her side through various difficulties. They might include scenarios where Renesmee is in danger and Jacob's unwavering commitment to her is highlighted.
When writing a 'Twilight Jacob vomiting' fanfiction, start with a strong plot idea that incorporates this rather unique event. You could base it on his werewolf nature. For example, maybe he's been poisoned by something that only affects werewolves. Develop the story around how he copes with this situation, how his friends and family react. As for the actual vomiting part, describe it vividly but not too graphically. You can use it as a turning point in the story, perhaps leading to a discovery or a change in his relationships.