Oreko is a small child wearing a diving helmet, a green dress, and no shoes. When interacted with in the underwater area, she gives Sabitsuki the Diving Helmet effect. Sometimes she is seen walking around in the underwater area and her house, and sometimes she is seen working on a large black and orange machine.
Oreko appears in two, possibly three other areas in the game depending on player interpretation. In the industrial maze she is seen floating in a tank, and this area leads to another area where, in the Sabitsuki chapter, she is seen holding hands with a bloody and beaten Sabitsuki, wheras during the endgame, she is missing and only the bloody and beaten girl remains. However, during the endgame, another door is accessible in the north side of this area, which leads to a tank with a massive Sabitsuki floating in the same position as Oreko in the previous tank.
- Her name is derived from the abbreviation of 'orenji' (Japanese for 'orange') and 'ko' (Japanese for 'child').
- The aforementioned information about finding Oreko and the giant Sabitsuki in tanks opens up the fan speculation that Oreko may, in fact, be a younger version of Sabitsuki herself.
- Oreko could also be an imaginary friend whom Sabitsuki created to not be so alone after being hospitalized.
- Reason being that one of the heart monitors in the hospital leads to the underwater world where Oreko is found.