How Much Do You Know About Fate Zero Characters?

Explanation
Kiritsugu is the main protagonist of the novel. This can be inferred from the fact that he is the only character mentioned in the options who is not a supporting character or a side character. Additionally, the question asks for the "main" protagonist, implying that there may be other protagonists in the novel, but Kiritsugu is the central character around whom the story revolves.

Explanation
Irisviel is the main heroine of the novel.

Explanation
Saber is the servant among these names.

Explanation
Kirei is the correct answer because he is portrayed as the master of assassins in the Fate/stay night visual novel and anime series. He is a skilled fighter and strategist, known for his ruthless and cunning nature. Throughout the series, Kirei is shown to have a deep understanding of assassination techniques and is often involved in plotting and carrying out covert operations. His expertise in this field makes him the master of assassins in the Fate/stay night universe.

Explanation
Tokiomi is the father of Sakura.

Explanation
Aoi is the mother of Sakura.

Explanation
Risei is the regulator of the 4th Holy Grail War. In the Fate/stay night series, Risei Kotomine is the supervisor of the Holy Grail War and oversees the proceedings to ensure fairness and adherence to the rules. He is a member of the Mage's Association and plays a crucial role in maintaining order and resolving conflicts that arise during the war.

Explanation
Maiya is an assistant to Kiritsugu Emiya. This is evident from their close relationship and the fact that Maiya often assists Kiritsugu in his missions and tasks.

Explanation
Akeno Watanabe voiced the role of Natalia.

Explanation
Tarusuke Shingaki voiced the character of Kariya.