Shun Kaido is one of Saiki's classmates. He believes he possesses amazing powers that he has sealed away, and that he is constantly under threat from a secret organization known as the Dark Reunion. However, when confronted with difficult situations, he panics. When he is doing his "Jet Black Wings" (the name he gives himself) act, he speaks in a deeper, more powerful voice, but when he is in any kind of danger, his voice gets higher and more panicked.