He is a person who keeps promises.

The 120-cell is one of the regular polytopes in four dimensions.

Learning about the ancient special kana usage is very important for understanding ancient Japanese.

The Jōdai Tokushu Kanazukai is one of the notation methods of ancient Japan.

He is a perfectionist, so he is very strict about his work.

He publicly acknowledged that he is a homosexual.

He always looks at things like a pessimist.

He is always an optimist, believing in a bright future even in difficult situations.

He identifies himself as an atheist.

He is the intellectual leader of our team, always providing new ideas.