Dr. Eyepatch is a recurring character in The Super Milk-chan Show, known as a mysterious blue humanoid who is instantly recognizable by his black cloak, robotic arm, and the ever-changing design on the eyepatch covering his right eye. This eyepatch is not static and is a notable visual trait, as its imagery can shift multiple times even within a single episode. He holds the position of director at the Kings Idea Laboratory, a facility known for producing advanced and often bizarre scientific creations. As a resident of the television world, Dr. Eyepatch typically communicates with the main characters from within a monitor or a TV screen rather than appearing in person.

In his role within the story, Dr. Eyepatch functions primarily as a source of information and equipment. He is responsible for providing the shows protagonist, Milk, with a new invention or gadget in each episode, often to assist her on the nonsensical missions assigned by the President of Everything. Examples of his creations include a giant, malfunctioning mushroom that warps time and space, as well as the crude and argumentative Robodog Number One, designed to help Milk but which instead causes significant conflict. Beyond his role as an inventor, he also hosts segments such as a collection of blooper reels featuring the shows characters.

A defining aspect of Dr. Eyepatchs personality is his relationship with Tetsuko, Milks obsolete robot maid. While it is never fully clarified if he is her creator, he is implied to be a father figure to her, though a profoundly cruel and belittling one. He consistently insults Tetsuko, criticizes her performance, and frequently offers to have her replaced with a newer model, which is a source of significant distress for her. This dynamic is a recurring joke, contrasting the typical expectations of a creator with his callous and dismissive attitude toward his own work. His motivations appear to align with his job, showing little personal interest in the success of Milks missions beyond delivering the needed absurd machinery and taking every opportunity to torment Tetsuko. In terms of development, Dr. Eyepatch remains a constant and static character throughout the series, defined by his distinctive appearance, his practical role as the distributor of plot devices, and his one-note but memorable comedic function as the negligent father to Tetsuko.