An old grandfather who lives in the house could be a main character. He has a lot of stories and wisdom. Maybe he has had some previous encounter with aliens when he was young and now he can help the family deal with the situation in the attic. He could be the one to bridge the gap between the humans and the aliens.
The aliens themselves could be the main characters in a sense. We could follow their perspective as they explore the attic and try to figure out how to deal with the humans. There could be a lead alien who is more intelligent and in charge, and a couple of other aliens with different personalities, like a clumsy one and a curious one.
Well, there could be a brave kid character. This kid is not afraid to explore the attic and is the first to encounter the aliens. He or she then becomes the bridge between the aliens and the rest of the family.
The aliens in the attic could be in hiding from a more hostile alien race. The family living in the house unknowingly provides them with shelter. As the story progresses, the family and the aliens form an alliance to fight off the approaching threat.
In addition to the regular Naruto characters, some of the more powerful monsters could be main characters too. For instance, a giant dragon - like monster that has the power of flight and can breathe ice. It could be a reluctant ally at first but then grow to respect Naruto and his friends. And among the aliens, there could be a leader - type character who is extremely intelligent and has unique powers that pose a great threat to the Naruto world.
The main characters could include the most powerful counter guardians who are tasked with protecting the universe from the alien menace. There could also be an alien character who has a change of heart and decides to side with the counter guardians, and their journey of self - discovery and integration into the counter guardians' world could be a major part of the story.
One idea could be that the aliens are actually friendly but are misunderstood at first. They came to Earth to learn about human emotions and end up helping the family in the attic deal with their own internal problems.
The main characters are the children who are locked in the attic, like Cathy and her siblings.
Since I don't know the specific 'the lover in the attic story', it's difficult to say. But typically, there would be the two lovers as the main characters. There might also be other characters like family members or servants who could play important roles in the story, either by being obstacles to the lovers or being unknowingly involved in their secret.
Since I don't know the exact story, I can't say for sure. But it could be a young man and a young woman who are the main characters. Maybe one is from a wealthy family and the other is from a lower class, and they have to keep their love a secret in the attic.
Perhaps there is an old caretaker of the house who has some knowledge about the attic and its contents. And, of course, there might be the family members whose past Christmases are somehow tied to the items in the attic. The main character could be a curious youngster, full of wonder, who leads the exploration of the attic and uncovers the stories hidden within it.
Ruby Rose could definitely be one of the main characters. Her leadership skills and curiosity would make her interested in these aliens from Earth. She might be the one to initiate contact or try to understand their motives.