One of Bojji’s interesting abilities is lip-reading. Lip-reading isn’t an entirely new concept in anime as a lot of characters, mostly those regarded as geniuses, know how to do this. A common stereotype, however, is that deaf people can innately do this. It is true that some deaf people are benefitting from this, but not everybody can lip-read. Just like any skill, it requires studying and practice. Also, lip-reading isn’t really just observing a person’s mouth. It also requires observing facial expressions, gestures, and context. Even with all these factors present, only a fraction of what is spoken can actually be lip-read. While these prove how difficult lip-reading can be, it also highlights how amazing Bojji is.

Another interesting detail that Ranking of Kings shows is Bojji’s vocalizations. It is another misconception that deaf people are also mute. It is true that most of them cannot speak like a hearing person, but that doesn’t mean that they don’t have the ability to use speech. What happens is that they aren’t able to use it given the fact that they’ve never received any stimulus to learn from. In simpler terms, it’s the same as not knowing how to speak Slovakian simply because you’ve never had the chance to study it. By extension, being deaf doesn’t necessarily mean that they can’t make any sound, just as what Bojji shows in the anime.

Another interesting fact is that there is a population of deaf people that can actually speak. While there may still be some notable differences to a hearing person’s speech, it is more than functional for daily conversation. This is usually done by learning how to produce individual sounds and eventually stringing them into words, then sentences.