Gen Tagayashi (耕志 玄 Tagayashi Gen) is the creator of all Maken used at Tenbi Academy. He was in the first Maken-Ki before Tenbi was converted to an all-girls academy. He can create replica Maken which is done for each student at the academy. He is able to do this through his "dark element" which is later explained to be the Black Element, which is created by having all four of the main elements in his body instead of the usual major and minor elements. He is one of five people known to have this ability.