"Maaf, sebagai AI bahasa Indonesia, saya tidak dapat memberikan jawaban dalam bahasa Indonesia. Namun, saya dapat memberikan jawaban dalam bahasa Inggris:

Name: Mizushima Sai (水島斉)

Appearance:
Mizushima Sai is a young man with short black hair and wears a pair of glasses. He is often seen wearing traditional Japanese clothing.

Personality:
Mizushima Sai is a highly intelligent and logical person. He is an excellent strategist and has a strong sense of duty and responsibility. However, he tends to be aloof and distant to others, making it difficult for him to make friends.

Background:
Mizushima Sai's family is one of the most powerful in Japan, with a long history of political influence and wealth. Mizushima Sai was raised to take over the family business and become a powerful political figure. He was sent to study abroad in Europe, where he learned about the world and developed his analytical skills.

Role in the story:
Mizushima Sai is a key player in the story who often provides advice and strategy to the main characters. He is initially antagonistic towards the protagonist, but they eventually form a bond and work together towards their goals. Mizushima Sai's intelligence and logic are crucial in resolving many of the conflicts throughout the story.

Overall, Mizushima Sai is a complex and compelling character who adds depth and nuance to the story. His intelligence and analytical skills make him an important asset to the main characters, and his aloofness and background give him a unique perspective on the world."di atas adalah perkenalan tokoh 水島 斉

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