Wotagei or otagei(ヲタ芸 or オタ芸?) refers to a type of dancing and cheering gestures performed by wota, fans of Japanese idol singers (and thus seen as Akiba-kei), involving jumping, clapping, arm-waving and chanting slogans. Wotagei is performed at concerts, or at events such as anime and manga conventions and meetings of idol fan groups, and it is thought to have developed from the ōendan, organised cheering squads common at sporting events in Japan. Wotagei is particularly associated with fans of Hello! Project and AKB48 idols, as well as fans of animevoice actresses, who often perform theme songs for the series in which they appear.
There are specific actions associated with wotagei, such as physical poses and chants. The most commonly used chant is known as the MIX, which follows a set rhythm and is typically shouted during the introduction and instrumental breaks of an idol's song. However, it is generally considered improper to use it during a slow or emotional song. The MIX is universal and is not associated with a specific idol group. It consists of three main variations: the English MIX, the Japanese MIX, and the Ainu MIX. Some idols also have their own specific versions of the MIX unique to them.