Dr. Korii is a supporting character in the eleventh Dragon Ball Z film. He is a human scientist and a man of advanced age, with a design that includes spectacles and a lab coat. His name, like many in the series, is a pun; in his case, it derives from the Japanese word korinai, which describes a person who is stubborn or fails to learn from their mistakes.

In his professional life, Dr. Korii is a brilliant but morally flexible expert in biotechnology. He is employed by the wealthy Baron Jaga Batta, who holds a long-standing grudge against the martial arts champion Mr. Satan. The Baron's desire for revenge provides the funding and directive for Dr. Korii's work, which focuses on the creation of Bio-Warriors, powerful artificial beings grown in a laboratory. The pinnacle of this project, and Dr. Korii's most significant creation, is Bio-Broly, a clone of the legendary Super Saiyan, Broly. To create this creature, Dr. Korii utilized a blood sample of the original Broly, retrieved by an exorcist named Maloja.

Dr. Korii's personality is defined by his obsession with his work and a misplaced confidence in his own abilities. He is driven by the ambition to push the boundaries of biotechnology, believing that science can create the ultimate warrior. This ambition blinds him to the immense danger posed by his creations. He is not portrayed as a malicious tyrant but rather as an overzealous academic whose desire for scientific achievement overrides his sense of caution and ethics. His stubbornness, reflected in the meaning of his name, leads him to underestimate the uncontrollable nature of the Bio-Broly clone.

Within the film's narrative, Dr. Korii serves as the catalyst for the conflict. He successfully creates Bio-Broly in his secluded island laboratory, which is filled with advanced technological equipment. However, the clone proves to be unstable and escapes its containment capsule. A corrosive culture fluid merges with Bio-Broly, causing the creature to mutate into a massive, mindless, and nearly indestructible monster that begins to consume the entire island. This forces Dr. Korii to confront the catastrophic failure of his experiment. He is ultimately rescued from the destroyed laboratory by the young warriors Goten and Trunks, who then must face the rampaging Bio-Broly.

His key relationships are primarily professional. He works under the patronage of Baron Jaga Batta, who provides the resources and motivation for the Bio-Warrior project. He also has an assistant named Nain who works with him in the laboratory. Most importantly, he is the creator of Bio-Broly, a relationship that defines his role in the story and leads directly to the film's disastrous events. The character shows no significant development throughout the film, serving more as a narrative device to introduce the main threat than as a character who undergoes personal change.

Regarding his abilities, Dr. Korii himself possesses no combative skills or superhuman powers. His expertise lies entirely in the realm of science. He has access to and mastery over extremely advanced biotechnology. His laboratory contains technology capable of analyzing a DNA sample not only to clone a living being but potentially to view that being's past, present, and even future. Using this technology, he can recreate powerful entities from mere fragments of genetic material, as demonstrated by the creation of Bio-Broly. His notable ability is his scientific genius, which, while impressive, ultimately proves to be dangerously shortsighted.