In JumpStart Reading for Second Graders, Dr. O had mustard-yellow skin and a brown shell. He wore a brown tuxedo with a white collar, a red tie, and a red button. He also wore a monocle over his right eye.
In JumpStart Advanced 2nd Grade, he has peach skin and a darker brown shell. His tuxedo is now purple with a silver button, and he wears his monocle over his left eye.
Dr. O is devious, prideful, and sly. He dislikes CJ and constantly tries to outdo him.
In the Games
JumpStart Reading for Second Graders
While CJ and Edison are searching for the lost city of Ursulab, Dr. Listick and his henchman Stanley are also searching for Ursulab for their own greedy purposes. At the beginning of the game, Dr. Listick steals an ancient tablet holding the secrets of Ursulab from CJ and Edison, and attempts to trap them in some old ruins. CJ continues to search for Ursulab, and Dr. O and his minions constantly attempt to stop him.
Later in the game, Dr. Listick kidnaps CJ's butler McCloud. He forces CJ to give him the jewels needed to find Ursulab in exchange for McCloud. However, the only one who can find Ursulab is the one whose hand print fits the engraving in the tablet. Dr. Listick realizes it can't be him because he has no hands, and he feels utterly frustrated. After CJ restores Ursulab, one of Ursulab's elders turns Dr. Listick and Stanley into jewel statues.
JumpStart Advanced 2nd Grade
Dr. O returns to cause all sorts of problems in JumpStartville that JumpStart Headquarters has to fix. His schemes include freezing up the JumpStart Lake, filling a schoolhouse with worms, and attempting to make CJ's house sink into the swamp. CJ and Edison start collecting clues to find his hideout. Eventually his hideout is discovered, and Hopsalot creates an invention to capture him.