UBOA (CreepyPasta)(5)

Yume 2kki - In the Sky Kingdom world there is a dog-like character that resembles Uboa. This character has been called "Dogboa" by fans.
.flow - Uboa makes a cameo as a marking in the dead end room in the Underwater Temple.
Me - the Mask effect is a clear reference to Uboa's face, and the location it's found in is quite similar to Poniko's room.
Uboa has, strangely, become a meme, despite it's only appearing ingame one way.Uboa might have inspired the Hollow from Bleach (or the other way around) as he and some Hollows look very similar.