Mileena

Mortal Kombat character

Attractive woman. White skin. Slim, athletic body. Brown hair. Behind her mask is a gigantic mouth and the characteristic long, sharp Tarkatan teeth.

She has humanoid lips in basically the same place that a regular person's would be, but her cheeks are split into a Glasgow Grin nearly reaching her ears and are lined with teeth that look more like large canines rather than the needle straight teeth that the Tarkatans have. YMMV whether this makes her more conventionally attractive, or just more disturbing.

The Emperor feared if Kitana should ever discover the truth about her past, she'd turn against him. Kahn then ordered his sorcerer Shang Tsung to create an evil, vicious, and loyal clone of Kitana who would take her place. Tsung combined Kitana's essence with a Tarkatan's to achieve this purpose. However, something went wrong and the clone's face deformed into a hidden Tarkatan's mouth. Rather than disposing of her, she was given the name Mileena and introduced as Kitana's twin sister. During Mortal Kombat II, Shao Kahn began to grow suspicious of Kitana and Mileena was ordered to watch over her sister

Since her introduction up to 9, Mileena was little more than a psychotic, bestial monster. Starting from X, however, this has been slightly downplayed with her developing more of a human personality. Still played straight any time she fights. However, this trope is in full force again in 11, where Mileena's bloodlust and ferocity get worse as shown in-game and in intros, where even Rambo is disturbed by her.