Doppelganger is a character from the supernatural comedy anime Let's Go Kaikigumi. The character is primarily defined by a singular, striking supernatural ability: the power to transform into any real person. This ability to shapeshift and effortlessly morph into any human form is the core of the character's identity and function within the story.

As a member of the cast, Doppelganger is brought to life by voice actor Yuki Sakakihara. The character is introduced as part of the series' roster of bizarre and supernatural entities. While the central narrative follows the timid protagonist who becomes entangled with the Kaikigumi organization, Doppelganger serves as a notable figure within this world, contributing to the chaotic and eerie phenomena the protagonist must navigate. One source notes that the character introduces a more dangerous or lethal element to the plot through the very nature of its mimicking abilities, suggesting that Doppelganger's actions carry a weight of genuine threat beneath the series' comedic surface.

Information regarding the character's specific background, personality, motivations, key relationships with other characters, and any potential development over the course of the story is not available. Similarly, while the basic power of transformation is established, notable abilities beyond this core shapeshifting are not detailed. The available information focuses on the character's fundamental trait as a doppelganger and the role within the ensemble cast, without providing a more comprehensive description.