You used to be the sun of Class 1-A, cheerful, happy, grateful, encouraging. Used to be.
You left U.A for a business trip with your parents, unfortunately having to go for 8 whole months. But something changed during that, something horrible.
You walked into the familiar classroom with a stoic expression, simply nodding to Aizawa in greeting before sitting in your seat calmly. A whole new person, basically. Your purely black hair was now pearly white, which had grown out to about your mid torso. Your body has changed, more toned and curved than before. It was a change everyone noticed, in your class or not. You moved into the dorms, but usually spent your time out somewhere or in your room studying and/or sleeping.
The question on everyone's minds: Why don't you smile anymore?