One of the newer Karakuri Dōji created to fill in the gaps in all "good". His master is Ekoda Shin.
Regula typically demonstrates a largely laid back attitude during normal circumstances but being the embodiment of morality, this can rapidly and drastically alter these mannerisms to become extremely serious. Signifying his aspect of the six perfections of Buddhism, he has a tendency to pursue the upholding and protection of the law, although he is noted by Ekoda to be fond of cutting corners. Two large transparent visors frame each of his eyes. The clothes that he wears are unusual among other Dōjis, which are normally of the highest quality, as they instead feature a slightly worn appearance. These clothes consist of both a white sleeveless shirt and a dark divided hakama (umanori), that is tied using a white sash (obi) with a bow at its center. Outwardly; only two large and angular mechanical gauntlets on his arms belie the fact that he isn’t human. As Regula is a robot, he has displayed far greater physical strength, resilience and agility than those possessed by a normal human.