Luz is surely one of the main characters. She is often at the center of the action.
In the 'owl house novel', the main characters include Luz, a curious and brave human girl who gets drawn into the magical world of the Owl House. Eda, the Owl Lady, is a powerful witch with a bit of a wild side. She takes Luz under her wing. King, who claims to be a king but is actually a small and somewhat comical creature, is also a central part of the story. These characters interact with various other magical beings, and their relationships and adventures form the core of the novel.
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.
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.
I don't know the main characters in 'owl graphic novel' as there's not enough information. It could be the owl itself as the central character, maybe with some other forest animals as supporting characters like a wise old fox or a friendly squirrel.
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.
If it's a crossover with 'Frozen', Elsa would be a great character. Her ice powers could contrast with the warm - themed magic in 'The Owl House' in an interesting way. Anna's adventurous spirit would also fit well into the story. From 'The Legend of Korra', Korra could be included. Her ability to bend multiple elements and her strong - willed personality would make for some exciting interactions with the characters of 'The Owl House'. She could even learn new forms of magic from them.
Since it's an 'owl friends story', the main characters are probably the owls who are friends.
Since I don't know the exact 'owl boy story', I can only guess. There's probably the owl boy himself. Maybe there's an old owl who acts as his mentor, teaching him about the ways of owls.
The girl, who may be at the center of the story's events, and the owl, which might play different roles like a protector, a guide, or a friend to the girl. Their interactions are what make up the core of the 'girl and owl story'.
In 'the christmas owl story', the owl is surely one of the main characters. There may be a group of forest animals that are friends with the owl. And perhaps there's a mysterious figure, like a magical Christmas spirit that appears to the owl and helps it understand the true meaning of Christmas.
Luz would be an obvious choice. Since she has a connection to both the Human Realm and the Boiling Isles, she could be in the Human Realm for some reason, like bringing a bit of the magic she's learned back home and facing new challenges there. Another option could be a new human character that gets involved with the magic of the Owl House, maybe a neighbor of Luz who notices strange things going on at her house and gets pulled into the adventure.