Yuichiro is an important character. He is a strong - willed human who is determined to fight against the vampires. Mikaela is also crucial, having a complex relationship with Yuichiro.
In Seraph of the End stories, Yuichiro stands out as a key character. His determination to avenge his family and free humanity from the vampire rule drives much of the plot. Mikaela, his childhood friend turned vampire, adds an interesting dynamic. Guren is another important figure. He has a lot of power and influence among the humans. He is not only a fighter but also a thinker, trying to find the best ways to combat the vampires. There are also other characters like Shinoa and her squad, who play important roles in different battles and in the overall struggle of the humans against the vampires.