UBOA

Uboa is a Creepypasta based on a video game.

Uboa is a strange creature, usually considered male or genderless. Contrary to popular belief, Uboa may actually be female due to its eventual replacement of Poniko's sprite. There is a chance that it will replace Poniko when you turn off the light, and plays a continuous muted "aaaaaaah" sound, (if properly filtered) surprising most people.

When the event happens a bright flash fills the room, similar to a blowing light bulb, then the entire room changes and Uboa replaces Poniko (if you kill her before triggering the event, Uboa is not going to appear. However, you will be locked in Poniko's room). You cannot leave the room, and flipping the light switch only causes another flash of light. If you touch Uboa, you will be sent to a Monochrome Street highly similar to the White Desert (with even its soundtrack playing); which is a looped area flooded with white liquid (potentially a swamp or marsh), a strange monster in the background bleeding, and Uboa's face will become strangely warped. Despite this location's atmosphere being identical to the White Desert's, there are no routes that lead away from this area and into the White Desert itself. The only way to escape Uboa's Trap World is by pinching Madotsuki awake or by using the Medamaude effect.