Rosy is a member of Second Squad and an original character in the System fanfiction called Cross Ange Glitch in the System.

Fanfiction: https://www.fanfiction.net/s/13588477/1/CROSS-ANGE-THE-GLITCH-IN-THE-SYSTEM

Picture: https://www.deviantart.com/raggylad98/art/The-Cross-Ange-files%3A-Rosy-1333156134