Zeena is a member of the Deadly Six and a villain in Sonic Lost World. She is also the only female member of the Deadly Six.
Zeena is the fourth to fight Sonic. However, she is distracted doing her nails, until Zavok tells her she's the only one who's fast enough, smart enough, and pretty enough to beat Sonic (although he doesn't seem to believe it himself). Sonic defeats her twice.
Later, Zeena appears in Lava Mountain alongside Zavok and Zor. She is, again, the fourth to fight Sonic, in a similar battle arena to Iggy Koopa in Super Mario World. In the end, Sonic defeats her and she explodes in a puff of smoke.
Zeena's is a green female Zeti, with a slender upper body that curves out into fairly wide hips. Zeena's upper body is lime green with two black stripes around her waist, while the lower half of her body is black. Zeena's small feet are tipped by small lime green claws, with a third smaller one on each heel. Zeena's tail is thin and curly, ending in a chameleon-like swirl (similar to Espio). Her wrists have black stripes around them while her five-fingered hands are black, each digit tipped by a hot pink nail.
Zeena has long green hair that parts to the right, extending down to her lower legs. On the left side of her head Zeena has a single curved horn with an alternating black and hot pink coloration. Her circular eyes are surrounded by black rings, while her eyes are blue with yellow sclera and yellow-orange eyelids. Zeena also has orange lips.
Zeena is a feisty, cold-hearted, cruel and serious person, who always completes a task when given one. Zeena has a terrifying temper and is not sky about showing it. She is very selfish, preferring to look after herself and is not likely to look after others. She is also very vain, given that she is seen doing her nails.
She appears to be inherently malicious, given that as soon as she and the rest of the Deadly Six broke free of Eggman's control, they all opted to destroy the Earth themselves.