冷血公主

This nickname, 'Cold-Blooded Princess,' combines an apparent lack of emotion or a cool, calm demeanor ('cold-blooded') with the noble and powerful image of a princess. This might suggest someone who has to be tough or distant in certain situations, perhaps as a defensive or self-protective attitude. It implies strength mixed with perceived heartlessness but may also imply a depth and complexity to the person behind the nickname, like they hide their vulnerability or emotions under a mask of ice-cold indifference.