Cornelius

Cornelius (コルネリウス Koruneriusu) is Rozemyne's older brother and the third son of Elvira and Karstedt. He is an apprentice knight who is assigned to Rozemyne once she is adopted by Sylvester. Like Angelica, he only guards her while she is in the Aub's Castle as they have not yet come of age.

Personality
He is friendly with Rozemyne, likely developing a siscon, and is impressed with her ability and dedication to learn how to become a proper noble. Seeing Rozemyne's efforts he is motivated himself to gives his best.

History
When Rozemyne moves into Karstedt's estate, he is quick to push her into taking over his role of emotional support for his mother, Elvira, as they are both fellow females. When Elvira told Cornelius about Rozemyne, he feared, that the same quarrels, from when Rozemary was still alive, would destroy the family again.

He tries to bond with Rozemyne and asks Ferdinand what he could give to Rozemyne. As Rozemyne is only interested in books, they make a field trip to the estate's book room. Cornelius unaware of Rozemyne's poor health, was taught the cruel way that Rozemyne would immediately faint. Without even reaching their destination Rozemyne faints. After learning about Rozemyne's poor health, he talks to Ferdinand about it. They set up a trap for Wilfried to teach him to be careful with Rozemyne. This does leave Rozemyne unconscious and blood-covered but she is healed by Ferdinand. This is done before her guardian knights officially their duty so that they wouldn't be held responsible for Rozemyne's wounds.