The werebear's role is pretty simple. The bear (or some other werecreature) kills one villager each night independently of the wolves. The bear is not allied with the wolves and does not know who they are. The bear and the wolves are just as dangerous to each other as they are to the villagers.
I am not saying that there will or will not be another werecreature independent of the wolves in this game, just answering The Sixth Wizard's question.
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I ♣ baby seals.
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