The novel might explore themes of power, revenge, and forgiveness. Maybe the knight's hatred is based on misunderstandings, and as the story progresses, they come to understand each other better. Or it could be a political thriller with both characters caught in a web of schemes.
In the ending of the vampire knight manga, Youji was not with anyone. In the final words of the manga, it was a good joke to fight against the dark forces with other vampires, but it did not involve any plot related to personal feelings. The ending of the Vampire Knight was an open-ended one. The readers could come to different conclusions according to their own imagination.
In this alternate scenario, it could lead to a lot of tension and conflict within the team. Naruto might be less inclined to follow Kakashi's lead and could even try to train on his own, causing problems for the group's dynamics.
Well, it could be about how the grand duke's adoption changes the saint's life and leads to various challenges and opportunities. Maybe there's a power struggle or a quest for justice involved.
The ending of the Vampire Knight was more complicated because it had changed and deepened many times between the manga and the novel. Here are some possible endings:
At the end of the manga, Yuki became the vampire hunter D and Zero became the knight who guarded her. In the battle with the vampires, Jiu Lanshu and the Pivot Party finally defeated the vampires and finally got together with Youji. However, due to the disappearance of Vampire Hunter D, Zero had no choice but to continue searching for other Vampire Hunters to protect humans.
At the end of the novel, Zero became the new vampire hunter and continued to protect humans. In the battle with the vampires, Zero and Youji finally got together and Jiu Lanshu became Zero's ally again. However, in the novel, the fight between the Central Party and the vampires did not end completely. New threats continued to emerge.
Different versions may have different endings, but in general, the vampire knight is a work of depth and complexity. Its ending may make people feel regretful or gratified.