Lumi is the first of the characters from the Frozen North, an alternate version of Svalbard. She is a guardian who protects the village as explained in detail on the refsheet.

Lumi's growth trigger is that under normal circumstances, she can grow or shrink at will. If she gets any colder, she finds it increasingly hard not to grow. The warmer she is, the more effort she has to put into growing.

She has ice abilities too with being a Sneasel. These include the ability to flash freeze things below her in solid ice, before quickly thawing it away again meaning she can walk on the ground as a megamacro without causing any damage. She can also create ice "snowglobes" to confine a threat, or safely capture a town or city to protect it.

Lumi without the hat and scarf can be viewed here: https://www.dropbox.com/s/07q9yjk6t.....i%202.jpg?dl=0