Zora

From Memory Alpha, the free Star Trek reference

Zora was a scientist known for her cruel and inhumane experiments on humanoid subjects to test the body chemistry of subject tribes on Tiburon.

In 2269, an image of Zora was created by the Excalbians in a plot devised to better understand the concepts of good and evil, with Zora representing evil. (TOS: "The Savage Curtain")

[edit] Background

Zora was played by actress/stuntwoman Carol Daniels DeMent.

Zora's appearance bears little resemblance to the male Tiburonians seen, which suggests that she may be of another race, indeed it was only stated she experimented on "subject tribes on Tiburon," without specifically stating that she was from there herself.