During the ritsuryo system, a banchō was a lower position in the Imperial Guard. In the Engi-Shiki there are several references to people holding this position.
In Japan in the 20th century, the term refers to a leader of juvenile delinquents in middle and high schools. It is thought that this current meaning originates from the original meaning of the term - the personalities of guard commanders. An alternative is that the word derives from tōbanchō (当番長?), a term for a position in the former Japanese army. Female banchō are called sukeban (スケ番?). The typical image of a banchō is a strong fighter who has a deep moral code for gangs and deals with troubled followers. Because of this, they tend to have a scruffy, rough and uncouth image. Banchō who rule several schools and have control of other banchō are called sōban (総番?), and in elementary schools and under, the term for banchō is gakitaishō (ガキ大将?).
In reality, though, banchō were becoming increasingly rare in the 1970s, and by the 1980s the term was relatively old-fashioned. Vestiges of the word still remained, though, such as in the nicknames for Kazuhiro Kiyohara and Daisuke Miura. By the end of the 20th century, the term almost did not exist at all, though groups of delinquents who committed crimes began to stand out. The term became a title of honor for people with leadership personalities and who stood against tough elements, and in turn, the negative connotation of the word diminished. It also became a scornful term for people who had a great deal of bravado.
On the other hand, in the manga world, due to a backlash, a genre called "banchō manga" has been created, with there being various types of banchō. As the negative image of the term has faded, in reality an impossible "righteous banchō" was introduced, where their actions have great influence.
In some schools, students would hold secret elections to pick banchō. Occasionally there would be fights between banchō and their subordinates, the loser of whom would become subordinate to the winner.
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