Also known as: 加湿器四天王
Fanmade group of Blue Archive characters, similar in nature to the Dryness Squad. Named after the slang term "加湿器" ("humidifier") which refers to characters with dark, clingy, quick-to-jealousy personalities, which stick to and suffocate you like excess humidity. Consists of Kayoko (Blue Archive), Kazusa (Blue Archive), Kikyou (Blue Archive), and Misaki (Blue Archive), who are generally perceived to be the most "humid" students, with Rumi (Blue Archive), Ichika (Blue Archive), Aoi (Blue Archive), Nagusa (Blue Archive), and Miyo (Blue Archive) sometimes being grouped in as well.
Known as the "Humidifier Four Heavenly Kings" in Japanese.