Why do they call bakugou, kachan in MHA if his name is Katsuki Bakugou

What do you think about fat babies?

& hurry! i need this done by 3: 00 pm! changes in artists' art brought about by the inventions of automobiles and trains shows that society influences what? brainliest whoever gets it correct!

Where does the wood yiri come from? i know it is somewhere in africa but a specific location, . worth 15 points hurry