Peggi, also known in some listings as Peggy, is a supporting character in the anime Tokyo ESP. He is an unusual penguin who has gained extrasensory perception, making him an esper among animals. He first appears flying through the skies of Tokyo in the company of a group of glowing fish, a sight that draws the attention of the protagonist Rinka Urushiba and sets the story of her own awakening into motion. Peggi is the pet of Murasaki Edoyama, a young girl with glasses to whom he is closely attached, and he is given the nickname Collector by the Professor, a title that reflects his rare and unusual psychic gift.

In terms of abilities, Peggi can fly freely, which is highly unusual for a penguin and allows him to move through the air, appear suddenly, and escape from threats. His secondary and far more significant power is the ability to extract the glowing fish that represent the ESP abilities of other espers and consume them. When Peggi devours one of these luminous fish, the affected esper loses their power, effectively neutralizing them. Because of this, his psychic ability is described as one of the rarest and possibly the most powerful in the series, as he can strip other ESP users of their abilities entirely.

Peggi's role in the story is that of a supporting figure rather than a main fighter. His presence is closely tied to the origins of the ESP phenomenon in Tokyo, since he is seen accompanying the glowing fish that grant powers to humans who touch them. After Rinka gains her abilities, she searches for the flying penguin in the hope of understanding what happened to her and finding a way to return to normal. During this search, Peggi is briefly targeted by a pair of penguin-hunters who attempt to capture him, but he escapes by flying to Murasaki, showing both his intelligence and his loyalty to his owner. His ability to remove ESP powers becomes more important as the conflict between espers escalates, making him a valuable asset to the side he supports.

Peggi's personality is presented as mysterious and quietly dependable. He does not speak and communicates through his actions, remaining devoted to Murasaki and accepting the humans who befriend them as allies. His exact thoughts and motivations are not explored in depth, and much about his origins is left unexplained, which adds to his air of mystery. He does not undergo a major personal transformation over the course of the anime; instead, he functions as a constant and unusual companion whose unique power makes him increasingly significant as the battles involving espers grow more serious. His defining relationship is with Murasaki, and through her he becomes connected to the wider group of heroes, including Rinka and Kyotaro Azuma, who come to regard him as a helpful and trustworthy presence despite his strange nature.