In 'kensuke's kingdom journeys grade 6 story', Kensuke is surely one of the main characters. Since it's about his kingdom, he is at the center of the story. There might be other important characters too. For example, if the kingdom has a council or a group of leaders, those people could be significant characters. Also, if there are any neighboring kingdoms, their rulers or emissaries could play important roles in the story as they interact with Kensuke and his kingdom.
The main character is likely Kensuke. But there could also be other characters like his friends or family members if they are part of his kingdom.
Most probably, Kensuke is the central character in this story. There may be side characters such as his assistants or comrades in the kingdom. They could help Kensuke in his journeys or present some challenges to him. Maybe there are also some animal characters if the kingdom has a diverse ecosystem.