Karaiya's grandfather has long wavy light hair that covers his face. During his flashback with Karaiya, he wears a light-colored traditional Japanese-style robe. His irises are light with cracked markings below his lower eyelids. Despite his age, he retains a youthful appearance, likely due to his vampirism. Like other vampires, he also bares fangs and sharp nails.
Karaiya's grandfather thinks that human beings are shallow creatures with evil hearts. He is inspired by Kars, who believed that the people who succeed are those who solely focus on winning rather than things like pride or conviction. Thus, like Kars, he is a megalomaniac who desires to stand at the top of the world. Believing that his grandson is not so different from him, he chooses to pass on what he learned from Kars.
At some point, he had a son with an unknown woman. Before World War II, he was deployed to St. Moritz, Switzerland on an intelligence operation. There, he witnessed something that transcended all of creation. It is implied that Kars turned him into a Vampire, but it is currently unknown how he escaped. He never told his son the truth about what he learned back then.
Decades later, he speaks with his grandson in Japan and advises him to never open his heart to other humans. He feels that Kars's ideology lives on in him and passes on those teachings to Karaiya. When Karaiya becomes an adult, he gives his grandson a part of his Vampire essence so that they could stand at the top of the world together.
- “You must never open your heart to "humans"… No matter how good they may pretend to be, they're foolish, shallow creatures with hearts as black as night.”
- “Those who wish to succeed should not concern themselves with meaningless pride and conviction, but instead focus solely on being the one who comes out on top!”
- “At the dawn of your adulthood, I shall share part of my essence with you… Once I do, you'll become able to stand atop the world alongside me.”