An Italian. Her father was a high official in the RSI. A lighthearted woman who did not lose that personality even after living a long time in a submarine. Since she was the only one of the Italians who could speak English, she began to form a close relationship with Kinzo, who was the only Japanese person who could speak that language. Kinzo recalls that he learned what love was for the first time when he met her. This meeting had a great effect on his fate and that of Rokkenjima.

Spoiler

Beatrice Castiglioni is the true Beatrice who was Kinzo's mistress, hidden away in Kuwadorian. She gave birth to Kinzo's daughter, Beatrice Ushiromiya, and died soon after. Kinzo treated the new Beatrice as her reincarnation, and thus she bore yet another child who is Kinzo's daughter and granddaughter at the same time, Yasuda, who is the current Beatrice who loves Battler.