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 very beautiful 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, cruel, sadistic, cold-hearted, and serious person, who always completes a task when given one. Zeena has a terrifying temper, and is confident about showing it. She is very selfish and treacherous, preferring to look after herself and is unlikely to look after others. She is also very vain, pompous, and egotistical, given that she is seen doing her nails; becoming swayed by mere compliments; at the same time becomes furious when insulted. Having an interest in fashion, her concern for appearance also extends to others and will openly criticize others fashion sense.
She seems to be flirtatious and provocative both in speech patterns and body language, as she tries to allure Sonic and finds his progressing through the many death traps as a sign of him liking her.
She also appears to be inherently manipulative and 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. Zeena taunts Sonic for her own amusement after Tails was seemingly roboticized but she along with Zavok and Zor was shocked and furious that Tails has tricked them into thinking that he was roboticized by attacking them which leave Zeena, Zavok and Zor no other choice but to retreat.
Well, I'd say you've got the right girl for the job!
~ Zeena to Zavok.
Last time we met, you ruined my nail art. Now I have to reapply a new coat.