5 times Katsuki acted as Izuku's Kaa-chan and 1 time he couldn't
Katsuki and Izuku have always been together so it's only natural that they take care of each other when they need it most. That's what family does after all! Or Katsuki is going to be the best. Everyone knows that he will be the best hero. What most people don't know is that he will be the best Kaa-chan too!