Fushin

Fushin is the Onisu of Betrayal and the Nightmare of the Scorpion Clan.

Reviled
Of all the Onisu, none is more reviled than Fushin. The samurai of Rokugan loathe it for the murder of Emperor Toturi I in 1158 and the denizens of the Shadowlands do not trust it either. Fushin is by far the most recognizable Onisu, despite it's stealthy demeanor, due to the assassination of Toturi. (4W p. 80)