Aisha

 was a female student at Merced Magnet School who began to suspect that she wasn't human, but rather an android. Nevertheless, she wasn't an emBed but an entirely unique piece of artificial intelligence largely coded by Dr. Sharon Carter.

From another point of view, however, Aisha was an experiment surreptitiously created by Carter for Rylium, and thus her presence outside Rylium facilities was legally tantamount to theft. To prevent Rylium from finding Aisha, Carter felt it necessary to revert and in some cases alter Aisha's programming in order to obscure her from Rylium employees.

This led to there being different "versions" of Aisha, and some longtime observers, like Jenny, noticing different personality traits and memories over time. Martin became so frustrated by the changes that he once noted to Sharon that he needed a notebook to keep the lies straight.

Background
Though she felt that Martin was her father, Levi was her boyfriend, and Cari was one of her best friends -- and that her future included a normal progression from secondary school to the university her dead mother attended — she came to believe that she wasn't human.

Her life was also punctuated by regular visits to a person she believed to be her therapist, Dr. Sharon Carter, but who was, in reality, someone more akin to a "handler", a person who was able to access her deep coding.

Her life was largely lived in a delicate tension between her dad's wish that she know the truth about herself, and those of Dr. Carter, who wanted to use the lies to protect her from the likes of Abel and Noah.

Once she became aware of the truth about herself, and that truth wasn't reverted, she strove to fully understand herself and to carve out her own life.

Ultimately, memories of her "brother" — a similarly advanced AI known as Calian — led her to return to Rylian facilities to rescue him. Though she was successful in finding him, their reunion was short-lived. Abel had infected her with a virus that robbed her of her memories and then "killed" her body. Both she and Calian were then literally scrapped.

However, she had previously downloaded her database into William and given Jenny the necessary clues to unlock that database. Once Jenny figured out the clue, William's body became the "host" for Aisha, who then set about searching the globe for people who could provide her with a new body.

Behind the scenes
Aisha is the main character of Don't Look Deeper. With a few exceptions, she is also the the character from whose perspective the story is told.

Since she doesn't know her own story, she is in some senses an unreliable narrator. The "truth" about her is further obscured by the show's non-linear storytelling style, as well as the fact that her parental figures, Martin and Sharon, aren't just lying to her, but frequently complicit in resetting her database. This means that there are effectively different "versions" of the character at diffierent points in the narrative.