Uboa is a character in a 32-bit PC game called Yume Nikki. He/ it appears in a random event in which you turn the lights off in Poniko's house, causing Poniko's sprite to change into Uboa. In this event, the room is changed slightly, and a muted "aaaaaaaaaaaah" sound is heard. He is known for surprising players.
by Alice Owen July 1, 2011