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, giving him the name "Deku," and even going as far as to suicide bait him on one known occasion. Despite their relationship becoming strained due to misunderstandings, Izuku still admires him for his strong quirk, natural combat capabilities, confidence, and ability to win. Katsuki often pushed Izuku away and feared his spirit, which led the both of them to drift away from each other, but after Kacchan vs Deku 2, it has been strongly foreshadowed that the both of them will eventually work as a team.

My Hero Academia’s third opening, Datte Atashi no Hero, is canonically about Izuku’s true feelings for Katsuki.

Bakudeku is, by far, the most popular ship in the East side of the fan base.