The plot might involve Loki's children being in a situation where they need the Avengers' help. Since the Avengers are known for protecting the Earth and the universe, they could get involved. There could be a lot of character development as the Avengers learn about Loki's children and vice versa. It could also explore how the Avengers' values might clash with those of Loki's kids at first.
The Avengers are a must - they are the heroes of the story. For Loki's side, his children who have their own distinct traits. If the story focuses on the more well - known children, then Fenrir, the giant wolf, would be a major character. He has great strength and could pose a real threat or an interesting ally. Also, Thor might have a special connection or conflict with him due to his relation to Loki.
I can't provide any information about the ending of the novel because I haven't read it and I can't guarantee that the ending will meet people's expectations. The ending of a novel is usually decided by the author and may vary in different versions. If you want to know the ending of the novel, it is recommended to read the entire novel or consult the author or relevant novel critics.
Endgame originated from the Marvel Comics universe. So, in a sense, it can be considered related to comic books. It brings those comic book elements to the big screen in an exciting way.
Definitely. Endgame is deeply rooted in the world of Marvel Comics. The movie builds upon the existing comic storylines and characters, bringing them to life on the big screen in an epic way.