Poniko
Poniko is a character appearing in Madotsuki's dream. She is held in high regard with fans.
Description
Poniko is a blonde girl with a ponytail, green shirt, a skirt and red shoes.
She, like Madotsuki herself, lives alone in a very bare house. She seems to want to be alone, as Madotsuki is only able to reach her house by going through a Pastel Lake. Poniko changes in a random event triggered by turning off the light in her house.
Fan Speculation
Room - Poniko and her room could be interpreted as early designs of a protagonist and her room, due to familiar aspects seen in Madotsuki's room.
Actions - No matter what you do, she doesn't seem to pay any attention to you, which is the point of some fandom hilarity. The only exception to this is the light switch.
== Uboa ==If you turn off the light, there is a 1 in 64 chance that you will see Uboa. It was originally thought you had to kill Poniko first and return for the secret, but has easily been proven false.
Description
Uboa is a strange creature, usually considered male or genderless. He replaces Poniko soon as you turn off the light, and plays a continuous "aaaaaaah" sound, surprising most people.
Once the event happens, you cannot go out the door. If you touch him, you will be sent to a dead-end room with white water, red sky and a strange monster in the background, and Uboa's face will change.
Fan Speculation
Hopelessness - Due to the aspect of being trapped, Uboa could be interpreted as a feeling of hopelessness.
Appeal - This secret may be the greatest appeal for downloading the game due to spread of Uboa to non-Yume Nikki websites.