Momakase is a recurring antagonist in Big Hero 6: The Series.
History
Momakase was hired by Mr. Yama to steal a prototype gravitational disruptor from Alistair Krei. In order to steal it, she worked for him as a sushi chef, being suggested to him by his people as 'one of the best' chefs in San Fransokyo, which she later clarified as being the best. She served him sushi with a special toxin, getting upset when Krei excessively dipped it in soy sauce. After eating it, Krei asked if the fish was the one that's poisonous when not cooked properly, and she took offense for doubting her skills. Still, the fish made effect on Krei, but Momakase assured it was the toxin she added what poisoned him and not the way it was cooked. Krei tried to call for help with his cell phone but Momakase threw a knife at it. She then stole the device from his safe, not knowing it was only half of it, and left after she sliced Krei's desk, clothes and glass of water, which only fell apart later when Big Hero 6 arrived to attend Krei.
Returning to her office located in the underground cooking competition, she met with Yama to give him the anti-gravity device and get paid, but Yama looked at his blueprints and saw it was just one half of it, thus refusing to pay and telling her to call him when she had the other half. Momakase decided to betray him and instead sell the whole device on the black market to the highest bidder.
She returned to Krei's office to search for the other half and was ambushed by Hiro, Wasabi and Baymax. She easily defeated Baymax by slashing his armor with her katana. Hiro grabbed the katana but she used her knife to fight him. Wasabi intervened, only for Momakase to corner him and destroy his blades. Despite the short fight, she was impressed by their skills and succeeded in stealing the device, leaving by using a smoke bomb as well as slicing the shelf behind them which also fell apart moments later. Back at her office, she called Yama (who now offered to pay her double) only to let him know about her change of plans, poisoning him with sushi. She told her guards to take him home and eventually give him the antidote. She then noticed Aunt Cass in the cooking ring, who had recently become a fighter in the competition and so far was undefeated. Momakase decided to challenge her. When the competition began, she cheated by making Cass trip over and subsequently tried to sabotage her dish multiple times, although most of her attempts actually resulted in Cass's favor.
During the competition, Big Hero 6 entered her office to retrieve the gravity device and fought her guards. They defeated the guards and Wasabi took the device. Momakase noticed the ongoing fight and rushed to deliver her plate to the competition judges, then dropped a net over Cass so that she couldn't deliver hers. The deadly thief then went into her office and fought the team, pinning Fred against a wall with her knives and trapping Honey Lemon in her own foam. She kicked Wasabi and made him drop the disruptor, which was accidentally turned on and made everything in the office and the cooking ring to turn blue. Thanks to the anti-gravity effect, Cass freed herself from the net and delivered her plate to the judges in time, winning the competition. Angry at the announcement, Momakase attacked her while floating, but Hiro deactivated the disruptor and she was trapped in the previously used net.
Momakase later appeared in the news when Alistair Krei ordered to arrest her. Aunt Cass, unaware that she was so dangerous, watched the report with Hiro, who praised her for standing up to her.
She will returns in the episode "Fan Friction".