'Arrow' Season 3: Devon Aoki cast as Tatsu 'Katana' YamashiroAdd to Favorites | Arrow
According to Deadline, Tatsu is a Japanese martial arts expert that goes by the code name of Katana. This sword-wielding warrior will be one of Oliver Queen's mentors during his time with ARGUS, to be shown in flashbacks throughout the coming season.
There is no word yet on whether or not Tatsu will make an appearance in present-day Starling City.
Aoki has appeared mostly in films, including "Sin City" and "2 Fast 2 Furious." Her "Arrow" character was developed in DC Comics graphic novels about the Green Arrow's origins.
"Arrow" Season 3 will air Wednesdays at 8 p.m. ET/PT on The CW.