Miura Rinaldi
Spoiler Miura is first seen in chapter 17 warming up under Zafila's supervision. In chapter 18, Einhalt and Cinque see her practising alone when they go to pick up Asteion. Her background is then explained to them by Nove, and Einhalt comments Miura is a high level fighter. She gets to know Nanoha in Yagami's house in chapter ex, where Zafila and Signum suggest Nanoha to do an image training with her. In the Inter-Middle starting in chapter 21, Miura meets Vivio for the first time and they are both in group 4 from the second stage. In the group's first Elite Class battle, she knocks out Micaiah with her Sword-drawing attacks, and Vivio will be her next opponent. (Source: Nanoha Wikia)