Katsuki Bakugo (爆ばく豪ごう勝かつ己き Bakugo Katsuki ? )[2], also known asKacchan(かっちゃん Katchan ? ) after his friends, and by his hero nameGod of the Big Bang Killer Dynamight(大だい•爆ばく•殺さつ•神しんダイナマイト Daibakusatsu-Shin Dainamaito ? ) , is a student of Class 1-A of the UA Academy , who is training to become a Hero . He is the series ' deuteragonistand childhood friend turned rival of Izuku Midoriya .