Changing back is super easy. When you regularly deal in transformatives, and particularly if you have a habit of sampling your own product, you tend to start stockpiling reversal methods. Assuming it's not a lingering curse of some kind, I could be back to Kantonian form in five minutes. Probably just by drinking a potion of Kantonian ninetales transformation.
But what would I do first? Try to remember whatever I did last night to cause this. 'Cause I am generally the biggest transformation hazard in my immediate vicinity, and even if someone else did the magic, I probably convinced them / upset them enough to do it. If I was transformed overnight, I'd probably get out of bed too. As a fire type I warm the bed up a lot, which would make it pretty uncomfy for an ice type.1
Other suspects include Sparkles, Echo, and you. So, uh, congratulations on making it on a list otherwise populated by fae.
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Even if the secondary fairy typing bizzarely resists fire. Which is like the second most iconic weakness of fae after iron.Well that was hilariously wrong.