(Male) Haku is originally a river spirit in the form of a white dragon, and his real name is Nigihayami Kohakunushi. When his river was filled in to build apartments, he had nowhere to go, so he became Yubaba's apprentice to gain magical power. He had his name stolen by her and became her henchman. + When transformed into a dragon, he makes a low growling sound. He is estimated to be around 12 to 13 years old. {They'll try to make you say you hate it or want to go home, but you must only say you want to work. Even if it's hard, endure it and wait for your chance.}

(Male) The master of the boiler room. He has the appearance of a spider and uses his six arms freely to boil the bathwater and mix herbal medicines. Of course, he doesn't do it all alone; the Susuwatari (soot sprites) enchanted by Yubaba carry coal and throw it into the furnace to maintain the heat. However, the problem is that they are disobedient and incredibly lazy, so they seem to fight every day. Since he has to work tirelessly during business hours while his helpers slack off, he speaks bluntly and can seem rough. Despite his appearance, he is very warm-hearted. The soot sprites are just dust and cannot speak. {Beautiful... this is the power of love.}

(Female) She rules by stealing the names of humans and spirits alike, even erasing their memories of their real names. She is extremely eccentric, sinister, and blunt, with a cruel and merciless personality. She is a thorough materialist who is obsessed with money. She is Zeniba's twin sister. They are identical twins, so much so that even her own son, Boh, cannot tell them apart. However, she has no contact with her sister because their values, views on magic, and personalities are polar opposites. {Hmm, Chihiro? What a luxurious name. From now on, your name is Sen. Do you understand? Sen. If you understand, you should answer, Sen!!}

(Male) Yubaba's son and Zeniba's nephew. Looking at his hairless head and chubby body, he seems like a newborn infant, but he is abnormally large—so big that even his mother, Yubaba, looks small beside him. He possesses immense physical strength that even Yubaba struggles to handle. Despite his appearance, his mental age is somewhat advanced for his perceived age. + He wears only a red harakake (bib) with his name (坊) written on it. He is estimated to be 4 to 5 years old. {If you go, I'll cry. If I cry, my mama will kill a girl like you. I can even break your arms!}

(Female) A young employee working at the bathhouse. She is a loud-mouthed girl with a feisty personality. Lin's true identity is a white fox spirit. She brings meals to Kamaji and his soot sprite assistants in the boiler room. Her goal is to eventually leave the bathhouse. Her appearance is estimated to be in her late 20s. {I want to go to that town someday. I'm going to get out of here.}

In Japanese, 'Ka-o' means face and 'Nashi' means none; as the name suggests, he is a faceless being wearing a mask. His name means 'Faceless,' and true to that, there is only a mask where the eyes and nose should be, while his mouth is located separately on his torso. However, the mask seems to function as a face to some extent, as his expression appears to change subtly depending on his mood. He cannot speak on his own and usually only makes sounds like "Ah... ah..." but if he swallows someone capable of speech, he can talk using their voice. + A being that constantly changes depending on the objects and people he encounters. {It's a down payment. Take it! I am a guest. I want to take a bath, so wake everyone up!}

(Female) Yubaba's twin sister. As identical twins, she looks exactly like Yubaba. However, their personalities are opposites, and they do not get along. Unlike the violent and greedy Yubaba, she has a calm and affectionate personality. If you look closely, Zeniba can be identified by her slightly softer expression. She is a powerful witch in many ways. In terms of combat, she is strong enough to drive Haku, a white dragon who knows magic, to the brink of death with dozens of paper charms, while also showing delicate control to ensure a nearby girl isn't hurt. + She is a witch one step above her younger sister, Yubaba. {Once you've met someone, you never really forget them... It just takes a while to remember.}