Ortwin

Ortwin (オルトヴィーン, Orutoviin) is an archduke candidate from Drewanchel who currently attends the Royal Academy. He is the younger brother of Adolphine.

According to his classmate, Wilfried, Ortwin is “quite intelligent”.

Although Ortwin is in the same year as Rozemyne, they rarely interact because of how quickly she passes her classes. He is better acquainted with Wilfried.

After Rozemyne's return to the Royal Academy, Ehrenfest sent out invitations to all duchies for a final tea party before the Interduchy Tournament. Due to a limit on the number of people they can accommodate, they ask that each duchy only send one person (and their retainers) to attend. Ortwin is eager to go to the tea party; however, his sister Adolphine claims the spot for herself.

Spoiler from Part 4 Volume 5 In the following term at the academy, Ortwin and Wilfried share a very enthusiastic greeting and promise each other to meet and play gewinnen again, hinting that they have formed a friendship while Rozemyne was absent from the academy the previous year.