Dietfried Bougainvillea

Dietfried Bougainvillea is a naval captain in the navy and [Gilbert](https://anilist.co/character/124790/)'s older brother. He was the one who found [Violet](https://anilist.co/character/90169/) and made her into Gilbert's "weapon" on his promotion to a major in the army.

(Source: Violet Evergarden wiki)