Polar bears are known for their strong constitutions and robust bodies. Metis is noted to be an exception to that.
Polar bears seem to generally dislike Werewolves, with Nene expressing instant dislike of Audrey first meeting. Nene mentions that while Mowgli does smell unpleasant (like a werewolf), she does not mind as much due to him not being an actual werewolf. Much of this rivalry appears to be one-sided aggression from the polar bear party, with similar patterns observed between Metis and Lapis, and Athena and Octavia. Since no male polar bear has appeared yet, we do not know if this mindset holds true for them too.