The other members of the werewolf pack could be important characters. They are Jacob's family in a way, and they would surely be affected by Jacob's state if he's 'too heavy'. For instance, Sam, as the alpha, might try to guide Jacob out of whatever is making him this way.
Edward could also be a character in this fanfic. His relationship with Bella and Jacob is always a point of tension. He might interact with Jacob in a different way due to Jacob's 'heaviness', perhaps seeing him as more of a threat or a figure to be pitied.
Well, it could be about Jacob having some sort of physical or emotional burden that makes him 'too heavy' in the context of the Twilight world. Maybe he's carrying the weight of his responsibilities in the werewolf pack, or perhaps he's dealing with a difficult emotional situation like unrequited love for Bella that's weighing him down.
One character could be Seth Clearwater. As a member of Jacob's pack, he could play an important role in their married life. Maybe he helps them out in times of trouble or is like a younger brother figure to their family.
It could be Renesmee. Since she has a connection with Jacob in the Twilight series, it's not a stretch to think that they might end up having a child together in a fanfic. Their relationship was already quite complex and a child would add another layer of depth to it.
Bella is an obvious choice as she was a central character in the original Twilight series. Pairing Jacob with Bella in a fanfiction that focuses on the imprint can lead to some really interesting scenarios, especially considering their complicated history in the books. It can explore what could have happened if Jacob's imprint had been on Bella from the start.
Sure. There might be some new characters created specifically for this fanfiction. Maybe a wise elder in the werewolf community who gives advice to Jacob about how to handle the situation with Bella and the pregnancy. Or perhaps a human friend of Bella's who discovers the truth and has to deal with the shock of the supernatural world.
Of course, the baby is also an important character in a way. Although it may not be able to communicate much at first, it will influence the actions and decisions of Bella and Jacob. Their families and friends, like the Cullens or the other members of Jacob's pack, could also be considered secondary characters as they will interact with Bella, Jacob and the baby in different ways.
There could be other pack members. For example, Sam Uley who is often an important figure in the pack hierarchy.
I don't know for sure as I'm not familiar with this 'jacob love story'. But surely Jacob is one of the main characters. There might be another character who is the object of Jacob's love.
The main characters are Kallie and Jacob. In most novels, these two would be the ones through whose eyes we see the story unfold. Their personalities, desires, and goals would drive the narrative. Kallie might be a strong - willed female character, and Jacob could be a more reserved male character, and their dynamic would form the core of the story.
Jacob is often very well - written. Writers can explore his complex emotions regarding his love for Bella and his loyalty to his werewolf pack. His struggle between his human side and werewolf nature can be delved into deeply in fanfiction.