This is Foxtail, 17years old, she sees ShadowRose & Magus as her non-relative brothers. ShadowRose & Magus dislike each other, she's always the one to stand in the middle of their fights.
Foxtail never listens to others, enjoy pissing off everyone. Still, she's being well cared.
Take a look at here portal/view/656146 so see who's Magus.