Quintessa

Quintessa, also known as The Great Deceiver and The Prime of Life, is a major antagonist in the Transformers Cinematic Universe, first appearing as one of the two main antagonists of the 2017 film Transformers: The Last Knight(alongside Megatron). She is a Cybertronian sorceress, and one of the Creators of the Cybertronian race, revealing to be the creator of Optimus Prime as she planned to use him to restore Cybertron by destroying Earth.

She was voiced by Gemma Chan, who also portrayed her human form, Ya Zhou in Fantastic Beasts and Where to Find Them, and will soon portray Minn-Erva in the upcoming Marvel Cinematic Universe film, Captain Marvel.

PERSONALITY
Quintessa started off as cool, collected, imperturbable, and benevolent, as she considers Optimus Prime to be one of her finest creations and revered by much of the Cybertronians. However, she turns out to be extremely cold-hearted uncompromising, opprobrious, wrathful, diabolical, and manipulative, as she has no qualms in draining Earth's energies to restore Cybertron, even at the cost of killing life on Earth.

Being a powerful sorceress in general, Quintessa is shown to be deluded, sarcastic, and treacherous, as she believes that her actions are at best for the survival of Cybertron. She also blames Optimus for the war between the Autobots formally led by Sentinel Prime and Decepticons that ravaged much of Cybertron; even when a furious Optimus pointed out that Megatron (the former apprentice of The Fallen and current leader of the Decepticons) is the one responsible for causing the war in the first place, Quintessa angrily disagrees and proceeds to pin the blame for Cybertron's destruction on Optimus before brainwashing the latter into doing her bidding.

Her true goal is to destroy Cybertron's ancient enemy, Unicron, which she believes to be Earth's true form. She will do anything to kill him.