Bojji

Appearance
Bojji is an abnormally-petite young boy. He has black hair with a single strand protruding onto his forehead, black eyes, and rosy red cheeks. He wears a blue suit, white tights/hose, black shoes, and a tiny crown on his head.

Bojji's original crown has been lost, and he now wears a nearly identical fabric crown made for him by Kage.

Personality
Though dismissed as deaf and dumb by most of the Bosse Kingdom, Bojji is actually intelligent, empathetic, and hyper-aware of the people around him. He is kind to a fault, and extremely giving of himself, even in situations where he may be hurt or humiliated.

Bojji is extremely hard-working and sincere, traits that tend to draw people to him even if they can't always understand him.

Plot
On one fine morning in the kingdom, Bojji meets a shadow like figure out in the forests. The shadow introduces itself as Kage. Kage tried to rob him, but he didn't have any money, so instead, Bojji gave him his clothes, which turn out to be pretty expensive. At first, they are both afraid of each other, but they become acclimated to each other by agreeing to meet every day so that Boji may give Kage his clothes. The two get extremely close, but the cost of their relationship awaits them ahead, on a perilous road littered with razor-sharp blades...

Swordsmanship
Bojji shows significant talent as a swordsman. He demonstrated excellent speed, intuition, and footwork in his practice match with Daida, repeatedly striking his younger brother (albeit so weakly the strikes didn't matter). This is likely due to Bojji's hyperfocus, an ability he uses to read lips and understand his surroundings at all times. Bojji learned this skill from the giant snake Mitsumata, who also taught him his evasion and footwork techniques.

After completing special training with Desper, Bojji has learned how to use his agility and precision to defeat enemies, rather than raw power. To do this Bojji first studied the physical weaknesses of as many species as possible, then learned how to target those weaknesses with a form of pinpoint swordsmanship using a small rapier. Bojji is so talented at this that, according to Desper, he is capable of disabling a person without leaving a mark. In addition to his pinpoint swordsmanship Bojji has also acquired a mysterious new ability, one Desper believes he'll rarely need to use.

These new techniques have made Bojji the strongest man in the world, according to the Magic Mirror.

Giant Heritage
Though he's received none of their physical power or stature, Bojji is technically a member of the giant race, and still has some of their attributes. He cannot be poisoned, for example, due to his giant heritage (giants are known for their sturdy stomachs).

Cursed Body
Bojji was born abnormally small, weak, and deaf. He is unable to properly wield a normal sword and can be injured easily. Many in the Bosse Kingdom call Bojji an idiot, but this may just be an antiquated way of referring to his deafness, as Bojji shows no mental disabilities.

According to Desper Bojji has no physical strength, and no amount of training or exercise will ever improve his condition. His strength cannot be enhanced because there is literally nothing to enhance. This weakness is the result of an extremely strong curse, one so powerful it actively repels the cursed mists of the Underworld (as noticed by King Desher).

It has been revealed in flashback that the reason for Bojji's weakness is his father, King Bosse. While still a wandering adventurer Bosse made a deal with a devil to steal his first-born son's physical strength and vitality. This power boost was enough to make Bosse the strongest man on earth, at the cost of some of his lifespan. Bojji is unaware of this.

Trivia

 * 1) He is very bad at cooking, as noted by both Kage and Desper.
 * 2) He is technically a member of the giant race, and has inherited their immunity to poison.
 * 3) In an interview done with Sōsuke Tōka it has been revealed that his favourite color is indigo blue.
 * 4) Bojji does not have a canonical age. Most assume he's between 10-12 years old, though several Japanese articles suggest he was 14 at the beginning of the story.