Movie
Description
Osushi-chan is a small, white puppy who appears in Burn the Witch as the constant companion of the student Balgo Parks. Balgo found the dog on the street roughly two months before the main events of the story and has cared for him without separation ever since, keeping the puppy close at all times. In ordinary daily life Osushi-chan acts like a gentle, docile, and affectionate puppy, and Balgo dotes on him to an exaggerated degree, praising him with claims such as winning the Nobel cuteness award for ten consecutive years and declaring that his cuteness alone could build a house.

Beneath this harmless appearance, Osushi-chan is actually a Disguiser, a type of dragon that impersonates other creatures by assuming their form, which is why he is also described as a dragon dog. His true nature becomes visible through specific triggers: whenever Balgo sneezes, laughs too hard, imitates Osushi-chan's cry, or faces genuine danger, the creature's dragon wings suddenly emerge. The transformation can be undone by holding and petting him, which calms him down and returns him to his usual puppy form.

When his dragon nature fully reveals itself, Osushi-chan takes the shape of a large black dragon with a lighter underbelly, four thick legs, two enormous wings, heavy scales, and many sharp teeth. In this form he is capable of flight and can carry Balgo through the air, and his actions remain centered on protecting his owner. Because he belongs to a classification of dragon known as a Dark Dragon, Osushi-chan possesses a higher level of intelligence. Through living alongside Balgo and absorbing his negative emotions, he has developed a limited ability to speak human language, although he only ever utters a single inappropriate request directed toward the witch Noel Niihashi and does not appear to understand the meaning of what he says.

In the story, Osushi-chan serves as Balgo's devoted pet and as a recurring mascot-like presence. His hidden identity as a Disguiser ties him to a larger pattern of dragons impersonating humans and animals within the setting, and it brings him into contact with the Wing Bind officers Noel Niihashi and Ninny Spangcole, who handle dragon-related incidents. His relationship with Balgo defines his role: he was rescued by Balgo, is looked after with great devotion, and reacts protectively whenever his owner is threatened. His interactions with the witches are mostly incidental, but Noel is notably able to calm him down by holding and petting him, and his tendency to speak out of turn toward her provides recurring moments of comedy.

Osushi-chan's development is modest but present. He begins as an apparently ordinary stray puppy and is gradually revealed to be a disguised dragon, and over time he gains a rudimentary grasp of human speech shaped by the emotions he absorbs from Balgo. His notable abilities include his disguise as a puppy, the sudden emergence of dragon wings in response to his owner's reactions or danger, transformation into a large dark dragon, flight, and a small measure of spoken language.