|Real name||Stephanie Demeanor|
|Trademark Features||Red dress, grey boots, blond hair, ugly face, and a very muscular body which she uses as a deadly weapon.|
|Extra Specialty||Incredibly strong, built very much like an Amazon warrior. Capable of carrying very heavy loads, punching through walls, and bending steel.|
|Significant Episode Appearances||The Case of The Missing Memory, The Case of The Bogus Justice Machine, The Case of The Blur Bandits, The Case of Iceberg Pirates, The Case of The Sinister Spa, The Case of Big Boss' Bye Bye, The Case of The Big Boss' Master Plan, The Case of The Super Shakedown, The Case of the Crook with a Conscience, The Case of The Half-Pint Hero.|
|Voiced by||Paulina Gillis|
In the comics, Ms. Demeanor is seen as a different criminal in traits and appearance with red hair and a red dress with torn edges. She has two Jamaican henchmen named Hench and Mann by her side, who show up to help her overthrow Big Boss and become the next crimelord of Empire City on a few occasions.
"Ms. Demeanor" also refers to a fictional villain in the complex Where in the World is Carmen Sandiego? story and song structure.
Ms. Demeanor along with Turbo Tu-Tone went to ransasked the apartment house where Cindy Johnson (A.K.A. Captain Crimefighter) and her mother is staying at in an effort to find the missing loot that was robbed from a bank. The C.O.P.S., alerted to the scene, arrived and sneaked into the apartment. No one is there. Evidently, the 2 crooks who ransacked the apartment took off to escape just before the C.O.P.S. arrived at the apartment building. Unfortunately, Cindy's mother is also not there as well. Cindy began to cry, assuming that the crooks have kidnapped her mother and did something terrible to her. But then, Cindy's mother arrived with a sack of groceries in her arms. Cindy is glad to see her mother, who is disturbed by what happened. Nevertheless, she is glad to see that Cindy is all right. As Bulletproof explain to her exactly what had happened, Ms. Demeanor and Turbo, who were spying on them, started making plans to kidnap Cindy and use her to find out where Rock Krusher, who partake in the robbery only to get caught and arrested, hid the stolen loot at. As the C.O.P.S. leave, Bulletproof gave Cindy a special homing device that would come in handy later on if she encounters the crooks once again.
As the C.O.P.S. leave Hardtop asks Bulletproof if he can stay around Cindy's apartment to provide additional security to the area. Bulletproof granted his request and drove off back to the precinct while Hardtop stayed to keep an eye on the surrounding area. He wasn't there for long. Turbo was there and lured Hardtop away from the area, giving Ms. Demeanor a chance to sneak in and try to kidnapped Cindy. Ms. Demeanor climbed up the fire escape to Cindy's apartment and waited until her mother leaves the room before she came in and kidnap Cindy. As she took Cindy away, Cindy took her Captain Crimefighter helmet with the tracking device inside with her and lead Ms. Demeanor to where she saw Rock Krusher hid the loot at. As Ms Demeanor took the loot from the box, Cindy turned on her homing device. The C.O.P.S. instantly respond, racing all the way to the construction site to arrest Ms Demeanor and rescue Cindy along the way. Cindy however was able to escape as Ms. Demeanor pushed the elevator button to go up and Cindy stepped down just as the elevator began to go up with Ms. Demeanor inside. Ms. Demeanor tried to escape the C.O.P.S. at the top of the construction site, but she was caught by Sundown, who used a crane to catch her and suspend her in midair right in front of Bulletproof. Ms. Demeanor gave up from there. Then, as Ms. Demeanor is being hauled up into the paddywagon to be taken away, Cindy gave a reprimanded speech to Ms. Demeanor, telling her straight that stealing is wrong. Ms Demeanor is then hauled away. Bulletproof tells her what a great speech she had made, which prompted Cindy's mother to reconsider her opinion on what Cindy dreams about and agrees to let her become a crimefighter after all when she grows up - much to Cindy's joy and delight.