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Snowla is a humanoid-like figure made of snow found in Snow Lampposts at any bench.
She doesn't do much but look around, sitting, but at the same time it seems she doesn't melt within the level.
She may look at you, smile, maybe even wave if you stop by, but other than that there is not much she can do.
You can allow her to follow you, but she'll only do it for a bit until she moves back to a bench.
If you manage to get Snowla out of Snow Lampposts, she will melt, but don't worry, she reappears if that is so.
Snowla is built like a life-sized anime girl that is entirely made up of snow.