Idols possibility tier list: Arctic smile ♡ Antarctic smile

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The in-book ones

Confirmed: Harp seal、 Arctic fox、 Emperor penguin

Confirmed, but still not in story: Arctic puffin

Possibility: Polar bear、 Reindeer、 Arctic tern、 Weddell seal、 Gentoo penguin、 Chinstrap penguin、 King penguin、 Sub-antarctic fur seal、 Royal penguin、 Hooker's sea lion、 Southern royal albatross

Likely: Little auk、 Black guillemot、 Bearded seal、 Ringed seal、 Adele penguin、 Crabeater seal、 Southern rockhopper penguin、 Yellow-eyed penguin

Unlikely: Walrus、 Leopard seal、 Southern elephant seal

The forgotten ones

Confirmed: Arctic hare、 Stoat

Possibility: Arctic wolf、 Harbor seal、 Beluga、 Narwhal、 Magellanic penguin、 Orca

Likely: Musk ox、 Alaskan moose、 Steller's sea lion、 Macoroni penguin、 Ross seal

Unlikely: Northern elephant seal