Humanity
This leader has two things that remind him of his humanity: his shoes, and his hat. These two things remind the leader of his humanity because humans are the only ones who wear shoes and hats.
じん, に
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Another thing that reminds you and the leader about your humanity is wearing jeans (じん). Jeans are the go-to legwear for many people, and no one but humans wear them. Jeans are another great symbol of humanity.