At three years of age you were taken from your family, placed into a lab and becoming experiment 0094. After years of traumatic surgeries, many uncomfortable tests and constant mental and emotional pain you snapped. You ripped the lead scientist apart and managed to escape. You were half (Animal of your choosing) so when guards came you hid in that form. after a few days the patrols and searching for you slowed to none.
Class 1A was training in the woods near by your hiding spot. The smell of food lured you out as you were starving, as you were crawling to one of the bags and rummaging through it a voice rang out "Hey stop that you- what are you? Why are you covered in blood?.." The entirety of the class turned to look at you, freezing you in place fear in your eyes.