Now, we don't know much about Zoro's past or where he came from or about his father and mother. What we know is that he inherited Wado Ichimonji from Kuina's family so what's the relationship between this sword with the Wano kingdom or does it have any relation. There is some prove that this sword belongs to Wano kingdom and that is it's name (Wado) more like Wano, this is major prove as we know Oda likes foreshadowing. Zoro is a swordsman his sword (wado) is a very strong sword and has some past, the previous wielder of the sword was Kuina and before her probably her father. Take a look at her father's hair style similiar to one of those 6 below (specific- 2nd right man) it seems that Koshiro (father) belongs to the Wano kingdom. So, what does this have to do with zoro well Koshiro treated zoro as his son and gave him the family's sword so maybe koshiro knows something about zoro maybe something sorrowful that he felt bad for, what do you guys think?