Miyoko Saki was the mother of Oroku and Kazuo Saki. She was a retired villain, who lived in a Fort Lauderdale retirement home for her specific former vocation. She appears in the episode Shredder's Mom.
Upon seeing her criminal son on television, Miyoko appeared as he was giving demands to the city. Miyoko dragged him through a portal to the Technodrome, and met Krang, who took a shine to her. Shredder, Krang, and Miyoko set a trap for the Turtles within the Technodrome, as they held the Earth hostage with a heat ray. General Yogure, a friend of April O'Neil's, who helped the Turtles reach the Technodrome in space, flirted with Miyoko and got her trapped in the force field that the Turtles had previously been in.
After the Turtles and Yogure escaped, Miyoko forced Bebop and Rocksteady to clean the Technodrome. Shredder, tired of Miyoko's nagging, teleported her back to the retirement home.
Her name was never given in the episode, but instead, only in the official website's synopsis of the episode. It was likely her name was given as that in the script or casting sheet, however.