Unfortunately, without more context, it's difficult to provide the full story of 'bou kotha kou'. It could be a name of a story within a small community or an emerging piece of literature. If you could give some more details like where you heard it from or what kind of story it is (e.g. a love story, a mystery) it would be easier to answer.
Since I don't know this particular story, it might be a story that is specific to a certain community or area. It could be about a relationship between a Kabuliwala (someone from Kabul perhaps) and a Bengali woman. But without more information, it's hard to tell the full story.
I'm sorry, I'm not familiar with the specific 'kabuliwalar bengali bou' story. It might be a relatively unknown or regional story. You could try to find it in local libraries, ask local storytellers or search in specialized Bengali literature resources.
The 'King of Kotha' is a story that likely involves a power struggle in the area of Kotha. It might revolve around a character who rises to become the dominant figure, facing challenges and rivalries along the way.
I'm not sure exactly who the main characters are in the 'King of Kotha story' as I don't have detailed knowledge about it. But usually in such stories, there would be a protagonist who aims to be the king, and likely some antagonists who oppose him or her.
Musashibo Sugaki was a legendary character. He was a monk soldier at the end of the Heian era and one of the traditional representatives of the Japanese Bushido spirit. However, the search results did not mention any specific information about the Musashi Bou tattoo. Therefore, according to the information provided, I don't know the details of Musashi Bou's tattoo.