First Appearance: The Powerpuff Girls, "Monkey See, Doggy Do",
Other Appearances: Various issues of comics and books featuring the Powerpuff Girls.
Merchandising: Mojo Jojo has no doubt appeared on a number of Powerpuff Girls merchandise, including plush toys and video games.
Biography: Mojo Jojo was originally Jojo, Professor Utonium's laboratory assistant, a hyperactive chimp who always broke everything. Jojo was the inadvertent cause of the creation of the Powerpuff Girls, as it was he who pushed the Professor into the container of Chemical X during Utonium's experiment to create the perfect little girls. The resultant explosion created the girls, as well as mutated him into a super-intelligent chimp with green skin. After the creation of the Powerpuff Girls, Professor Utonium lost interest in Jojo (understandable, as he probably had his hands full with Bubbles, Blossom and Buttercup), and forgot about him. Jojo stole a tattered overcoat and scarf to wear, as well as covering up his expanded head with a paper bag, running away.
Oddly, when he's not trying to take over or destroy Townsville, Mojo Jojo is an ordinary citizen of Townsville, shopping for groceries, and sometimes being visited by the girls, who treat him as a neighbor. As his attempts to take over failed (thanks to the girls), Mojo tried to prevent the creation of the girls by traveling back in time, although this ended up creating a paradox in which he got the Professor interested in science in the first place.
Mojo tends to be disliked by all other simians, because they feel he gives them a bad name. Usually working alone, he once teamed up with three other villains to become the Beat-Alls (when they accidentally worked together to beat the girls) in a hilarious episode with all sorts of Beatles references. In this episode, the Beat-Alls are broken up when Mojo gets romantically involved with a female chimp taking the Yoko Ono role, but it turns out her affections were part of a trick planned by the Girls!
Mojo has saved the day five times during the course of the series, including one time when he defeated an alien invader who took over the planet Earth, which was intolerable by his standards because it copied his own plans!
Powers: As might be expected, Mojo's mutation has given him incredible intelligence, which he routinely uses to create giant robots, energy weapons, and the like. He's also a skilled karate master.
Miscellaneous: Mojo Jojo is one of my favorite villains on Powerpuff Girls, probably a lot of that has to do with his unique pattern of speech! He will never give a simple response to a question, but instead will reiterate ad nauseum what he means. There appear to be two influences to this speech pattern: the dubbing of some Japanese animation, as well as the instructions for using the Holy Hand Grenade of Antioch from Monty Python and the Holy Grail. For example, in the episode "Los Dos Mojos," he says: