Canon wise, the events of the series as whole have recently concluded. That said, the canon events don't really have an influence on this plot or region of Japan. The only canon roles that may be seen or mentioned for now are Botan, Genkai and Lord Koenma, as there's no current plans to involve anyone else (canon wise). There are plans for an eventual tourmaline of sorts but whether that is something based on canon or not, has yet to be decided.