Z.W.E.I. (ツヴァイ, Tsuvai) is a character in the Soul series of fighting games. His first appearance is in the series' sixth installment, Soulcalibur V. He is a dark and brooding man who wields an arming sword with three handles and can summon a lupine being called E.I.N. during battle. Z.W.E.I. is a member of Schwarzwind, and was ordered by Siegfried to find the new wielder for Soul Calibur.