I think there should be a story about him and how he woke up in the snow with amnesia and he goes to find out who he was but it runs out he was CREATED, perhaps for evil purposes and he begins to build a forest army and wage war against the human world, but he discovers that there is love in the human world and he kind of falls apart, literally, but his fluff is used to make a nest and he's reborn as a little sparrow who flies around the world three times to see it all and all the people in it.
Ermines aren't rodents. They belong to the mustelidae, order carnivora. (I guess that makes them closer related to bears and wolves than to marmots.)
...Sorry, it's one of my pet peeves when people get that wrong. But honestly, this animal clearly belongs in the order of Completely Adorable! I love the stubby little arms and paws, and the white belly is adorable! And the colours you gave the critter are beautiful.