BakuDeku

BakuDeku is the slash ship between Katsuki Bakugo and Izuku Midoriya from the anime and manga series My Hero Academia.

Canon
Izuku and Katsuki have known each other since they were very young, but their relationship has deteriorated over the years (though interestingly enough, Izuku continues to call Katsuki by his childhood nickname, "Kacchan"). Ever since failing to develop a Quirk, Katsuki has seen Izuku as weak and bullied him relentlessly, giving him the name "Deku," and even going as far as to suicide bait him on one known occasion. It can be assumed that it is due to Katsuki's abuse that Izuku has such a skittish nature, stutter, and initially low self-confidence.

Izuku states that Katsuki makes all of Izuku's insecurities about himself bubble to the surface. Despite the two absolutely hating each other, Izuku still admires him for his strong quirk, natural combat capabilities, confidence, and ability to win.