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Rojo is a recurring antagonist in the Ben 10 series. She started as a leader of a group of female bikers named Joey, but after inspecting one of Vilgax's drones, she becomes a super droid. She appears as a minor antagonist in the original series, Ultimate Alien, and Omniverse.
She was voiced by Jennifer Hale, who also played Sedusa and Princess Morbucks in The Powerpuff Girls, Shannon Lucas in Scooby-Doo! Moon Monster Madness, Alecto in God of War: Ascension, Kronika in Mortal Kombat 11, and Black Knight in Generator Rex. Hale voiced the character in the original series and Omniverse, but the role was performed Kari Wahlgren in Ultimate Alien, who's more notable Ben 10 role has been Charmcaster in the classic era.
Joey robbed an armorer with her group of bikers, but they were defeated by Ben Tennyson as Four-Arms who later defeated two drones that belong to Vilgax. After the battle, Joey picks up the remains of one of Vilgax's drones which then merges with the biker. Joey becomes a cyborg called Rojo and gains superhuman strength, speed, flight and metal claws. However, Vilgax can contact the biker through the drones' former parts and coerces her into obtaining the Omnitrix for him. Ben transforms into Upgrade and defeats Rojo by shorting her out and Gwen knocks her unconscious. She was then arrested by the police after these events.
Rojo was later recruited into Negative 10 and given a new suit by the Forever Knights. She had a rivalry with Charmcaster while in the group. Later, she along with most of her fellow members, start fighting over who is worthy of leading. She and other members of the Negative 10 end up trapped in a force field after Ben's group takes advantage of their greed.
In Ben 10: Ultimate Alien, she reorganizes her biker gang to rob a train, only to be defeated by Rath and his allies.
- Neither her real name or her cyborg name are said in her debut episode, though they are listed in the credits. In her following episodes, she is always addressed by her cyborg name. It can be assumed the latter is also an alias her human form uses.
- Her cyborg name, "Rojo", is Spanish for red, though is pronounced with an English "J", instead of being pronounced as "Ro-ho".
- Rojo is confirmed to be a lesbian https://ben10.fandom.com/wiki/Rojo#cite_note-5