Well, in many fanfics, there are protagonists who drive the story forward. In 'as the ring went south fanfic', it's possible that there's a group of adventurers. One of them might be the central character with a special connection to the ring. There could also be a character with a mysterious past who joins the group on their southward journey, adding an element of intrigue to the story.
I'm not entirely sure as I haven't read the 'as the ring went south fanfic' in detail. But usually in such stories, there could be a hero - like figure who is leading the journey south. Maybe there's also a wise old character who gives advice along the way.
In 'as the ring went south fanfic', perhaps an interesting plot point is the relationships that form or change as the characters go south. Some characters might start off as enemies but end up as allies due to the shared experiences on this journey. Also, there could be a mystery element related to the destination in the south, like a hidden power or a long - lost secret that the characters are unknowingly approaching.
Typically, in a fanfic related to Naruto, Naruto would be a main character. If the rasen ring is a new element, other characters like Kakashi could be involved as a mentor figure. Also, if the story is about a new generation, Boruto might make an appearance to learn about the significance of the rasen ring from Naruto.
The main characters are Bones and Galia. Bones, who is likely to be a complex character with his own set of values and emotions, is focused on getting the right engagement ring. He may have to overcome various obstacles in the process. Galia is the woman Bones loves, and she represents the future that Bones is looking forward to. Their relationship forms the core of the fanfic, and the engagement ring is just a symbol of their love and commitment in this story.
There's no way to be certain without reading it, but perhaps there's a female lead who is somehow connected to the ring. Maybe she has a special ability that is awakened by the ring, and there could be a male character who helps her on her journey with the ring. There could also be an antagonist who wants to steal the ring for their own malicious purposes.
Given that it's a South Park fanfic, we can assume that Stan, Kyle, Cartman and Kenny are central. But it's possible that the 'dusk of stars' aspect could bring in other characters. Maybe there's a mysterious figure who appears only during the starry dusk and has some connection to the events that unfold. It could also be that the parents of the main kids play a more significant role than usual if the events in the dusk of stars somehow affect the whole town. For example, Randy might get involved if there's something strange going on with the stars that impacts the local environment or economy.
Frodo could be one. Since he was also closely associated with the ring in the original story, he might play a role in this fanfic, perhaps as a supporter or someone who has doubts about Bilbo's ability to destroy the ring.
There is also an old and wise wizard. He guides the hero in his journey regarding the rings, using his knowledge and magic. He has a deep understanding of the power of the rings and the danger they pose. For example, he might know the history of how the rings were created and what their true purpose is. He tries to ensure that the power of the rings is not misused by the wrong hands.
Since I don't know the exact 'the ring story', it's hard to say. But generally, there could be a finder of the ring. Maybe a young adventurer or a curious child.
I'm not sure specifically as there are many novels that could be called 'the ring novel'. But generally, there could be a protagonist who discovers the ring and gets caught up in its mystery. There might also be an antagonist who wants to use the ring's power for their own evil purposes.
Often in a 'the south novel', there's an older, wiser character. This could be an elderly relative like a grandparent or an old family friend. They serve as a source of advice and often have a lot of stories about the past of the south, which can provide context and depth to the novel.