Hotaru Haganezuka (鋼鐵はがね塚づか 蛍ほたる Haganezuka Hotaru?) is a swordsmith affiliated with the Demon Slayer Corps.
Hotaru wears a sunflower-patterned robe and a large, woven hat with hanging floral wind chimes. His head is wrapped in a spotted cloth and his face is concealed by a Hyottoko mask (wooden festival mask), similar to Sakonji Urokodaki.
During the Swordsmith Village Arc, he is seen with a more muscular build compared to his initial appearance.[2]
Unmasked, Hotaru is revealed to have long, black hair coupled with sharp eyes and distinctly-shaped thick eyebrows.[3] However upon being attacked by Upper Rank 5, Gyokko, Hotaru now possesses several deep scars and cuts from the Demon all over his body, including an X-shaped one on his face, and has now lost the use of his right eye.
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