Master Penguin functions as a guiding teacher in the Prism Show world, prominently featured in *Pretty Rhythm: Aurora Dream* and *Dear My Future*. He mentors aspiring Prism Stars, though his substantial ego and self-centered nature frequently introduce comedic moments, such as his conviction that a phone strap bearing his image would be the ultimate gift for students like Aira or Mia. His deepest affection, beyond himself, is solely for his human partner, Yamada.

Physically, he is a green penguin adorned with a blue wig. He possesses fantastical abilities, including flight and the strength to carry an adult like Yamada, defying real-world penguin limitations. Mia affectionately calls him "Pen-chan-sensei".

His backstory, detailed in *Pretty Rhythm: Rainbow Live*, reveals a prior partnership with June. He abandoned her to seek his destined human "soulmate", later found to be Yamada (also known as Tanaka). This abandonment led to June staying in the human world and eventually becoming the Prism Queen, while Master Penguin faced punishment in "mascot hell". He later appeared in this mascot hell setting during a cameo in *PriPara* season 1, episode 19.