Gengai Hiraga

As Edo’s most brilliant yet eccentric inventor, this master mechanic frequently assists the Yorozuya with his crude, unpredictable machinery. Though he often causes chaos by forgetting to provide operating instructions, his technical genius is vital, ranging from repairing Tama to upgrading Sa-chan's glasses into weapons. Haunted by the loss of his son, Saburou, during the Joui wars, he once nearly fell prey to Takasugi’s manipulation but ultimately chose peace, continuing his work as the proprietor of Machine Hall.