The leader of a group of Kolaati traffickers at the Nekrit Expanse supply station, who demands warp plasma from Voyager as payment for Wixiban's debt.
Tosin is a Kolaati who runs narcotics through the station administered by Bahrat. He appears in the third-season Voyager episode Fair Trade.
Wixiban owes Tosin's organisation, and after the killing of the dealer Sutok the Kolaati want compensation. Tosin tells Wixiban and Neelix to bring him a quantity of warp plasma from Voyager or be killed.
Neelix cannot bring himself to steal from the ship. He goes to Bahrat instead and offers to deliver the gang in exchange for his friends' release. At the handover he vents the plasma and dares Tosin to fire, and the Kolaati are arrested by station security.