Perhaps it has something to do with the life habits of bats. In my impression, Batman is always related to darkness, and should be regarded as the dark night knight. Unlike other famous Marvel heroes, even in Batman's suit, he doesn't have other people's superpowers. He is a knight with excellent fighting skills. Because of being crowned with the color of the dark night, Batman is often a serious face, unsmiling, and strangers should not be approached. Therefore, there is a slight lack of life breath in character creation.
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