There's Stormgren, who serves as a link between the humans and the Overlords in the early days of the alien occupation. He has to communicate with Karellen and convey the Overlords' messages to the humans. His character shows the initial human reaction and adaptation to the new situation. And then there are the ordinary people in the novel, whose collective reactions and behaviors also contribute to the overall story as they represent the general human population dealing with this huge change.
The Overlords are crucial characters. They are the alien beings who come to Earth and take over. Their appearance and actions drive the entire plot. Another important character is Karellen, an Overlord who has a significant role in interacting with humans. He is often the face of the alien rule and his decisions impact the future of humanity.
Jan Rodricks is an important human character. He is a scientist who tries to understand the Overlords and their intentions. His journey, both physically as he tries to reach the Overlords' home planet, and mentally as he grapples with the changes on Earth, is a major part of the story. Also, the children in the novel are important. As the title 'childhood's end' implies, the children play a key role in the new direction humanity is taking under the Overlords' influence.
In 'childhood's end novel', Karellen is a very important character. He is an Overlord and has a great influence on humanity. There are also some human characters who react to the changes brought about by the Overlords. Their stories and reactions help to show the impact on the human race as a whole. For example, there are scientists and regular people who are trying to understand and cope with the new situation.
The main characters are Karellen, an Overlord. He has a very calm and mysterious presence. He oversees the changes on Earth. Stormgren is also important. He has a lot of interactions with Karellen and tries to understand the Overlords' intentions. The children are crucial characters too. Their development and the mystery surrounding their evolution drive much of the plot. There are other human characters as well, but these three elements - the alien Karellen, the human mediator Stormgren, and the evolving children - are at the heart of the story.
Margaret Schlegel is very important. She is intelligent and tries to bridge the gap between different social classes. Helen Schlegel is another key character, she is more impulsive than Margaret. Mr. Wilcox is also important as he represents the upper - class values and has a complex relationship with the Schlegel sisters.
Christopher Tietjens is key. He is a man of honor and duty, and his internal struggles form a major part of the narrative. Sylvia Tietjens, his wife, is a character full of contradictions. She is both alluring and troublesome. Valentine Wannop plays an important role as well. She is in love with Christopher and their relationship is tested by the social and personal circumstances in the novel.
Captain Stanhope is an important character. He is a complex figure, a brave leader but also haunted by the war and his own inner demons.
Yuichiro Hyakuya is very important. He is a determined and vengeful character, driven by the need to take revenge on vampires for his family's death. Mikaela Hyakuya is another key character. He has a complex relationship with Yuichiro. Guren Ichinose also plays a significant role. He is a leader figure among the humans and has his own secrets and motives.
Alice herself is surely an important character at the end. She might be the central figure around which the final events of the novel revolve. There could also be a mentor - like character who helps her reach a certain conclusion or understanding at the end.
The Overlords are main characters. They are the alien beings who have a huge impact on humanity.
I really can't say exactly who the important characters are in 'the end of the circle robotech novel' without reading it. But in the Robotech universe, there are often characters who are in charge of the mecha units. They could be important in the end part, leading their teams in the final battles or negotiations. There might also be some scientist characters who play a crucial role if the end involves some technological revelations or solutions.
John is obviously one of the most important characters. He's right there in the title. His friend, whose name I can't recall at the moment but is also central to the story. And then there are all those strange creatures and entities that they interact with. They play important roles in creating the crazy and dangerous situations that John and his friend have to face.