Japanese Voice Actor: Daisuke Namikawa
English Voice Actor: Robbie Daymond
Manga Debut: Chapter 9
Anime Debut: Season 1 Episode 5
Hotaru was the one who brought the sword of Tanjiro after he passed the final selection exam. He delivered it to the house of Sakonji. Tanjiro invited him to enter the house but Hotaru refused and instead just explained about the sword.
The sword according to Hotaru can change color. When Tanjiro held the sword and it became jet black Hotaru was disappointed. This was because he is one of the Master Swordsmith of the Swordsmith Village. He was born in the village and learned the craft of forging the Nichirin Sword.
After Tanjiro broke his sword in the fight with Rui, Hotaru repaired the sword and chased Tanjiro with a knife when he brought it back after Tanjiro recovered. When he lost his sword after they fought Enmu and Akaza, Hotaru got furious again.
Hotaru no longer faced Tanjiro after he chipped the sword in his fight in the entertainment district but he sent an angry letter. When they traveled to the Swordsmith Village to have Tanjiro’s sword repaired, Tanjiro instead found a sword inside a training machine. The sword was 300 years old and was repaired by Hotaru which is seen to be decisive in battle.
Hotaru wears a woven hat with hanging floral wind chimes. His face is concealed by a wooden festival mask or Hyottoko mask. As the series progresses he becomes more muscular. He always wears his mask and when he took it off it was shown that he has long black hair, sharp eyes, and his eyebrows have a distinct shape.
He wears a haori that has a sunflower pattern. After the attack at the Swordsmith Village, he possesses deep scars all over his body. He also lost his left eye from the attack and has an x-shaped scar on his face.
Hotaru only cares about what happens to the sword. It was shown on several occasions how he would get angry when the sword would get broken. He would get angry over the damages on the sword. He is capable of talking for hours about swords.
This trait is true for every person who resides in the village. His dedication to creating swords is extraordinary that he would get angry when his sword would be damaged. Regardless of whether the sword was used to defeat demons or not, he wanted the swords to be in top shape.
When he gets angry, he would calm himself by eating mitarashi dango. If eating dango does not work, he would ask someone to pin him down or tickle him. He has eccentric and asocial behavior. These behaviors are the reason why he would lose clients.
He would forget about his surroundings and would ignore everyone when he is forging a sword. When Tanjiro expressed his trust in him to still forge his sword despite his attitude, Hotaru was happy to forge his sword.
Hotaru is an expert in Tantojutsu, which is a special ability he has. The only time he would display this ability is when he would chase Tanjiro for destroying his sword. Despite being a master with forging a sword, he does not display any special ability.
He could not even wield the sword. He would train hard for stamina and strength so he could forge a better sword. His ability to forge exceptional swords, like the 300-year-old sword from Yoriichi Type Zero, is proof that he is one of the Master Swordsmith of the Swordsmith village.