Tiese Shtolienen

Teiza Schtrinen (ティーゼ・シュトリーネン) is Eugeo's valet who learns swordsmanship under him. She along with Ronie are introduced in the Alicization Arc.

Background
She's the eldest daughter of a 6th Class Noble family, she entered the Sword Academy as an intent to rise her family status. She's a valet because she's one of the top 12 of her year, but she states that it isn't because she's good, that it's because the test was about a Sacred Art that she was good at.

Alicization Running
She's introduced as Eugeo's valet, she just finished cleaning his room and it's ready to be dismissed along with Ronie when Kirito enters from the window and gives them a bag with honey pies and dismiss them by telling them to share it with their roomates.

Alicization Turning
Teiza and Ronie invite their two mentors on a picnic and, while they are searching for a location to have the picnic, Teiza explains to Eugeo the difference between fifth and sixth class nobles compared to fourth class and higher nobles and the right the higher classes had to judge the lower ones.

During the picnic Teiza and Ronie request their two mentors to help another valet, who is being made to do embarrassing tasks by her mentor, Humbert Zizek.

Later, after cleaning Eugeo's room, Teiza is asked to have a seat and Eugeo explains that he had a talk with Zizek and that everything should be fine. Teiza then goes on to talk about how she was afraid to marry into an upper class noble family, because she was scared that her spouse might be someone like Zizek. She then asks Eugeo to marry her if he places high in the Four Empires Unity Tournament, since he would become an aristocrat for life if he did.

When Zizek continues abusing Frenica, she visits Humbert and Raios' bedroom with Ronie, and fall into their trap by losing their composture and disrespecting them, so Humbert and Raios try to rape them as "punishment" but are stopped by Eugeo and later Kirito.