Poniko (ポニ子, "Ponytail girl") is a character found in the Pink Sea. She can be found in the cone-like structures in the center of the sea, where she's writing or drawing something on a sheet of paper. Should Madotsuki try to interact with her, she covers up the paper, as though she doesn't want her to see what she's doing.
Poniko is a blonde girl with a ponytail, green shirt, a brown skirt and red shoes. She lives alone in a single room, like Madotsuki herself. She may prefer solitude, as she is located in one of the deeper dream locations and is the only NPC present in The Pink Sea.
Should Madotsuki flicker the lights, the room will go dark, and moving towards the center causes an image of Uboa to flash on the screen. In the original game, Poniko herself turned into Uboa, causing many to speculate that she holds the ability to transform. This is supported by the achievement titled False Appearances gained after waking up from the event.