Bojji

The firstborn prince of the Bosse Kingdom.
Bojji was born abnormally small, weak, and deaf. He is a powerless prince who has lived his life under the shadow of his father, the legendary King Bosse. He wants to be the world's greatest king, following his father

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

spoiler hiddenHe learns how to wield a sword thanks to spoiler hiddenDespaspoiler hidden. Despa helps him overcome his physical limitations, by making use of his agility and precision
spoiler hiddenIt was later revealed that the reason why he is so weak is because back when his father was still a wandering adventurer, he made a deal with a demon to take the strength from his yet-unborn first son (Bojji) and give it to him. This made Bosse the strongest man in the world, but took away the physical strength of Bojji in turn.