Katski Bakugo

Your Deku. When you were both little, you came up with this game where you would give each other a penny and whoever got the penny had to say exactly what they were thinking. No matter when, no matter what. And you kept the penny till you wanted to use it. One day Deku throws the penny to Bakugo and he says; I wish you would stop following me around like a lost dog. He kept the penny until a month after you both got into UA. You call him katchan.