Kazuyuki Sakamoto is the elementary school teacher for the combined first and second grade class in the village where Barakamon takes place. As a resident of the rural community, he embodies the straightforward and grounded nature of island life. His personality is described as rough around the edges, which can come across as a little overwhelming to others, but this is presented as a typical trait for a rural man in that setting.

In his professional role, Kazuyuki is shown taking part in local initiatives, such as a child protection campaign where he helps assign security patrol duties to the children. He is an adult figure within Seishuu Handa's age group, representing one of the local residents who interact with the calligrapher during his time on the island. His hobby is fishing, which he pursues with notable dedication as it is described as being quite expensive. A peculiar personal detail is that he is unable to ride a bicycle. The search results do not provide further details on his motivations, specific key relationships with other characters, personal development throughout the story, or other notable abilities beyond his fishing hobby.