Stür Neubauten is one of the three Noise Sisters, Players waging war against the Earless using specialized combat mecha called Equipment. She serves as the brainy second-oldest sister within the trio. Her appearance includes short white hair, a constant gray dress revealing her right thigh, and gloves. A distinctive feature is her persistent use of facial covering, maintaining a concealed identity.

Alongside sisters Ein and Zende, Stür employs a coordinated combat style aesthetically blending demolition with creation. This involves Equipment-generated realistic illusions, trapping foes in imaginary structures or fabricating deceptive scenarios. The group exhibits dramatic mannerisms and exaggerated body language during confrontations.

In the narrative, Stür and her sisters detect a green light they suspect links to the legendary Player Jimi Stonefree. To investigate, they confront Mu and Echo Rec. Echo recognizes the sisters and requests autographs, thrilling the group as their first such request. Despite this, they swiftly capture Echo, using him as leverage against Mu to awaken Jimi's power. Their plan is interrupted by Bilin Valentine, who defeats the Noise Sisters and rescues Echo and Mu.

The Noise Sisters operate as a tightly-knit unit with no documented individual backstories or character development for Stür outside the group. Their collective role focuses on missions concerning Players and Earless conflicts, with Stür providing strategic intellect to their coordinated efforts.