Saotome Kururi

Japanese name:

早乙女 九瑠璃

The youngest of the nine Saotome sisters, Kururi Saotome is the Valkyrie of the Cannon, Rossweisse. She has a love for robots and spends most of her time building and creating random items. However, due to her powers, Midgard, that is, Earth, materials, don't work as well as Asgardian materials and most of the items she makes doesn't last long.

Wikipedia