(Pic completely and utterly disrelated.)
Matsudoki was an orphan. Possibly an orphan who'd had a good role-model, and was a strong girl who often went her own ways. But in a flurry of foster homes and orphanedges(coughnumbersworldcough), a good personatlity and strength can only take you that far. Perhaps she was intelligent for her age, but grownups in those kinds of places tend to look down on children. It's not like kids are, y'know, actual PEOPLE. The Toriningen and their spooky way of following Matsu around until they catch her fcan represent how the grownups were smiling and saying they just wanted the best for each child, perhaps while actively chasing down those who tried to escape the grownups falsehoods. Troiningen represent grownups. The few "good" toriningen just ignore Matsudoki, whatever she does.
Also, the mall and the psychologists office: The mall is full of people that see her. They respond a little to her. But she can never, never be one of them, becuase she's an orphan. Possibly disowned by her foster parents and maybe shut into a mental home due to being violent, probably because sitting in an orohanedge teaches kids to always distrust their peers, and since she had no suitable gronwup role models, her inner self is a child. She is probably around 15-16, but everyone just treats her like she's a small child, so she can't interact with the enviroment.
The other kids are harmless, but they're becoming far too many for her to keep track of. Coming and going, coming and going, they all start to look the same~(Sheild world and the wierd casino-like blinking world)
Poniko might be herself, the girl she once was before her parents died. She had a room, her own room. And the reason for it being in the "pastel shoals" and being in a maze is because she wants a safe place for herself. Call it a "happy place", if you like. But UBoa is there because no matter how she tries to deny it, everything wasn't better back then. Maybe she was bullied or her parents had problems. Also, Poniko has blonde hair. Maybe Matsudoki used to dye her hair, but couldn't keep it up because the school the orphanedge sent her to forced her to dye her hair back, and they did so in a very traumatic way. Thus the blonde hair represents a freer, happy Matsudoki.