Yu-Rei is basically the embodiment of being judged by your appearance—she's got a genuinely frightening face, lives in a haunted house, and yeah, people are understandably spooked by her. But she hates that everyone treats her like some kind of monster because of it. To complicate things further, she's allergic to sunlight, so she has to wear a protective suit whenever she goes outside. The problem? It looks exactly like a ghost costume, which, given her whole vibe, doesn't exactly help her case with people already nervous around her. Fans often note the irony of her name being a homophone for the Japanese word "ghost"—it's almost like she can't catch a break.
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