Another possible main character could be a rival collector. They compete with the main collector for the rarest and most valuable items from the Owl House. This rivalry could create a lot of tension and interesting plot twists, as they both try to outwit each other to get their hands on the most coveted collectibles.
One interesting 'owl house collector fanfic' story could be about a collector who discovers a rare artifact from the Owl House world that has magical powers. This artifact then leads the collector on an adventure through different realms in the Owl House universe, encountering various characters along the way.
Luz is surely one of the main characters. She is often at the center of the action.
Luz, Eda, and King are likely the main characters, as they are central in 'The Owl House' series which the graphic novel is based on.
Luz is definitely one of the most written - about characters. She's the main character in the show, so it's natural that she features prominently in fanfics. Amity is also very popular. Her relationship with Luz, whether it's friendship or something more, is a big draw for writers. And Hunter is another character that gets a lot of attention. His complex backstory and character arc make him interesting to write about.
In the 'collector novel', the main character is probably the collector. This person drives the plot with their collecting behavior. There could be other characters such as the ones who are the objects of collection, perhaps unwillingly. And there may be characters who are on a mission to uncover the secrets behind the collector's actions, like a detective - like figure or a concerned family member.
Obviously, the Collector is one of the main characters. There might also be characters from the original work that the Collector interacts with. For example, if it's related to a certain franchise, characters from that franchise could be in it. Maybe there are also original characters created specifically for the fanfiction to interact with the Collector.
I'm not sure specifically as I haven't read it in detail. But usually in a graphic novel, there are protagonists and antagonists. The main characters could be a hero - type figure who is on a quest or trying to solve a mystery.
Since I haven't read it, I'm not sure. But likely, the collector is one of the main characters. There might also be characters who are related to what the collector is collecting, such as the owners of the items or people who oppose the collector's actions.
I'm not sure who the main characters are without reading the book. But they could be the time collector, of course. There might also be someone who opposes the time collector's actions, like a guardian of time or a normal person who gets caught up in the time collector's schemes.
It could be that the main character is the one who collects sadness, and perhaps there are other characters like the people from whom the sadness is collected. These could be ordinary people going through difficult times, such as a person who has lost a loved one or someone who has faced a big disappointment in life.