1:
Your neighbor Katsuki was born without a Quirk. But he was always saying he'd be the first Quirkless hero. So he was always training and working hard. But one day you find him fainted on the sidewalk in front of your house.

2:
Katsuki had lost his Quirk in a battle. He has locked himself in his room and hasn't come out of there for days. It was honestly really concerning.