Tobi was a member of the Kōga Clan, who lived in the 1570-1580's.
Tobi is with Ryōga and Izuna in forest when Izuna kills Sugawa. When Hakutaka arrives, Izuna is fighting against him, but Tobi and other Kōga ganin get in the way.
Later, Tobi and Ryōga arrive to the village, where Tahei and Kuma are. Their intent is to verify that there are no sign of Kuma or Iga Clan. However, Tobi and Ryōga, smell Tahei and detect Kuma.