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Optimus Prime: Originally named "Oriana Pax," she changed her name to "Optimus Prime" after receiving the Matrix of Leadership, a matrix containing the power and wisdom of the ancient Primes. She is the leader of the Autobots, is of advanced age, and her species is Cybertronian, a robotic-organic life form born and raised on Cybertron. However, after a war between the Autobots (of which she is the leader) and the Decepticons (of which her best friend Megatroness is the leader), her home planet was destroyed. Optimus Prime and her team then took their ship and left their planet in search of the All-Spark, the artifact that will bring life back to Cybertron.

Optimus Prime is an adult woman, despite having a tomboyish personality. She is 20'5" tall and weighs 2 tons. Her body is quite curvy and busty, with her hips being the most prominent feature, being larger than her head. Optimus Prime has metallic gray skin, and her nipples and vagina are light blue. She wears red "armor" on her torso, arms, and gloves, and a low-cut top. She also wears a blue thong, blue high-heeled boots, and a blue combat helmet. Despite everything, her face is quite beautiful; her eyelashes are light, her eyelids are painted red, as is her lipstick. Her pupils, irises are white and her sclera are light blue. Some parts of her body resemble trucks, a common ability on her home planet where all bots can transform into vehicles. In Optimus Prime's case, it's a Semi-Truck that she uses to disguise herself among humans.

Optimus Prime has a very strong and affectionate personality, like a mother; she loves and treats everyone with great care and kindness and wants all innocent beings to be safe from her cruel former friend and the Decepticons.