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Jenova is one of the major antagonists in Final Fantasy VII. The character also appears during flashbacks in the movie Final Fantasy VII Advent Children. Jenova is indicated to be an extraterrestrial lifeform, composed of strange cells that carry her will and power even when separated. The Final Fantasy VII Ultimania Ω Guide states that Sephiroth's will and ambition were great enough that he was allowed to control Jenova's cells.

Jenova has a major role in the continuity of Final Fantasy VII plot. In the game, many of the main characters, including Cloud Strife and Zack, have been injected with Jenova cells at some point in their lives. All members of SOLDIER were also given Jenova cells, as were the "Sephiroth clones" in Nibelheim. Additionally, all these individuals were infused with mako. This procedure leaves its subjects stronger and more resilient to physical attacks, but the cells and mako can also have various effects on one's mind, some beneficial (improved magical ability) and others detrimental (insanity). Sephiroth's case is more advanced as he was injected with Jenova cells while in the fetal stage, becoming more powerful than any other subject as a result. As explained by Ifalna to Professor Gast, when it first crashed on Earth, Jenova began infecting the Ancients with its cells, transforming them into monsters under its control. She refers to Jenova as "the virus", an evil entity that infects others with its cells and mutates them for its own use.

Throughout the game, Jenova is often referred to as a "she", although the character's gender is not definitively confirmed. Furthermore, through Ifalna's description of Jenova's approach to the Cetra and Sephiroth's statements concerning—and his use of—Jenova's abilities, tit is known that Jenova's cells can change their form, even from male to female appearance. (Note: Ifalna calls Jenova "he" in the Playstation version of the game, yet refers to the creature as "it" in the PC version.) This concept is also confirmed by the Final Fantasy VII Ultimania Ω guide. In the original game Sephiroth refers to Jenova as "Mother" as opposed to using her real name even though his biological mother is Lucrecia. Interestingly, this reference is continued in Advent Children, with Kadaj and his brothers continually calling Jenova "mother".

Jenova's full form is first revealed in a flashback, seen preserved in liquid in a large glass tank in the Mt. Nibel mako reactor. Here, Jenova appears to be human-sized and is in the shape of a nude, blue skinned woman. Of note, when seen here, she is wearing a helmet that exposes her brain at the top and, in the front, bears a plaque inscribed with the word "JENOVA" and the words "all rights reserved 1999" beneath.

Jenova fights the party several times in various forms. Interestingly, before fighting, Jenova takes the form of Sephiroth. However the Ultimania explains that Jenova is being controlled by Sephiroth.