Izuko Gaen (臥煙 伊豆湖, Gaen Izuko) is a woman known for her claim to "know everything." She debuted in Tsubasa Tiger as Episode's latest client, and was in a different kind of business with the vampire hunter during the appearance of the tiger-shaped oddity Kako. Gaen is considered to be the "head honcho" of Oddity specialists by some.