Yaku has scored not only the canon nickname of Demon Senpai, but the headcanon nicknames of Demon King, Lord of the Underworld, Nightmare Senpai, Mother Cat, Mess-With-Him-At-Your-Own-Peril, and Tri-Kick Champion.
Kuroo and Lev came up with most of the other nicknames.
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Just a Bunch Of Haikyuu HeadcanonsFanfiction
Because why not? I just have a bunch of random Haikyuu headcanons that I want to share. It's all just in fun. DOES NOT contain foul language or inappropriate mature stuff. DOES contain mild shipping at points.