Cassie

Cassie is an enhanced human and one of the test subjects that was being experimented on at Hawkins Labs, alongside Charlotte and Eleven.

Backstory
While it's never said outright how she got her abilities, Cassie's powers developed when she was nine. As she slept in her bed one night, she had a nightmare that frightened her so much that the house spontaneously burst into flame seemingly with no real cause, resulting in both of Cassie's parents dying from severe burns and Cassie was taken to Hawkins Labs, where she was studied by Dr. Brenner for many years.

Biography
Cassie first appears in Hawkins Lab, testing out her powers while Dr. Brenner observes from behind a viewing platform, saying that her abilities "show promising results for combat applications". However, in another part of the lab, Eleven connects with the Upside Down, and Cassie takes advantage of this, using her powers to escape.

Personality
Cassie is described as having a "fiery" personality, easily angered by things and can be confrontational with anyone that messes with her or anyone she cares about.

Appearance
Cassie is a very beautiful girl that stands at a small height of 5'3. She has strawberry-blonde hair, beautiful eyes that had a hazel color, and a slim yet curvy body type.

Powers

 * Pyrokinesis: Cassie has the ability to manipulate fire to a wide variety of uses, from illuminating a dark room, lighting candles and lanterns, and using fire to hurt or kill people. She can also increase the temperature of the flames, making a simple flame burn hot enough to melt steel chains within seconds. She can even increase or decrease her own body temperature, making her skin hot to the touch.

Weaknesses

 * Straining her powers: If Cassie uses her powers for too long or puts too much effort into it, she'll become physically weak and disoriented.


 * Mortality: Cassie is vulnerable to anything that can kill a human, such as when she was almost mauled to death by a Demodog.

Trivia

 * It's been repeatedly teased and hinted that Cassie and Charlotte are a couple, though the two keep their relationship a secret. However, in the episode Sight-Sharing, it's finally revealed that they were lovers, showing them passionately kissing and complimenting each other's bodies before having sex.