I'm not sure as I haven't read it. But they could be environmentalists trying to save nature.
The main theme could be about environmental destruction and its consequences. It might show how human actions are leading to the end of nature as we know it.
The main characters in Howard's End include Margaret Schlegel, Helen Schlegel, Henry Wilcox, and Ruth Wilcox.
Since I haven't read 'axiom's end a novel', I can't tell you the main characters. But typically, main characters in a novel are those who drive the story forward. They could be heroes, villains, or ordinary people caught up in extraordinary situations. Maybe there's a young protagonist who has to overcome many obstacles in the story of this novel.
Since I haven't read the book, it's hard to say exactly. However, it's likely that there are key political figures within the empire, like senators or advisors. There could also be characters from outside the empire, such as invaders or diplomats. And don't forget the common folk, who are often the ones most affected by the empire's end and whose stories can be very important in showing the full picture.
I'm not sure specifically as I haven't read it, but usually in a novel about an empire's end, there could be a powerful emperor or empress as a main character.
Perhaps there is a lone traveler who has come to the end of the wave - ridden shore. This character could be on a quest, either a physical one like searching for a lost treasure or a more emotional one like finding peace after a long period of turmoil. Their encounters with the locals and the environment near the wave's end would form the crux of the story.
Since I haven't read 'dominion's end novel', it's hard to say exactly. But it might have a protagonist who is a part of the dominion and is trying to understand what is going wrong and stop the end. There could also be an antagonist, maybe a rival power or a traitor within the dominion.
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.
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 male protagonist is one of the main characters. His name is Reito Mizuhara. He was put into cryogenic sleep before the apocalyptic event. When he wakes up, he finds himself in this new world with a huge gender imbalance.