Eleven

"'You brought my powers back. I have to hold my end of the bargain, Ten... I mean... Ben.'"

Appearance
Eleven is a 14-year-old girl with brown hair, a prominent forehead, and plaid clothing. When using her powers, her nose bleeds; and the more psychic power she uses, the more her nose bleeds.

Personality
Raised in Hawkins National Laboratory and completely deprived of socialization, Eleven was timid, socially withdrawn and extremely cautious of other people. However, she became fiercely protective and showed unyielding loyalty towards those who cared for her. Thanks to the help of Max Mayfield, she has learned to be more independent.

In Stranger Things 10, she finds a new friend in Ben Tennyson. After the restoration of her powers, El seeks to help Ben by whatever means possible.

Powers and Abilities
Eleven was born with a vast array of preternatural abilities, acquired through a combination of inheritance and exposure to hallucinogenic drugs while in utero during her mother's time as an MKUltra test subject. These abilities were the reason she was abducted at birth and raised at Hawkins National Laboratory, where she was experimented on.

Eleven's powers would occasionally affect the nearby electricity; when attempting psychic communication, nearby lights would sometimes flicker or even go out entirely.

Levitation is her most recurrent power, she is able to manipulate objects, people and creatures with her mind. When amplified by her emotions, her telekinesis is strong enough to lift large and heavy objects, as well as use levitation.

To some extent and with varying results, she can transmit the voices of people and other sounds in other locations over electronic speakers.

Eleven could manipulate the bodies of living creatures to a certain extent, as shown when she fought a Demogorgon.

She originally had more powers than these, but the Omnitrix was unable to restore all of them.

While living in the woods for a month, Eleven learned crucial survival skills, such as hunting (by using her powers) and how to make a fire.

Weaknesses
Using her powers takes a physical toll on her body. When using her powers to perform more menial tasks, Eleven usually only suffers from nosebleeds. Based on how her powers are executed, it is likely the source of this blood is actually her brain.

Information taken and edited from the Stranger Things Wiki.