Speaking about role. Yamato was imprisoned in onigashima for 20 years. That means she may not know any technical skills on ship. But I find it ridiculous that her name comes from battleship name reference because she may not has technical skill. I think she is brawl-type person maybe because she was trained to be strong by the WSC. So a role that need strong person may fit for her
we know that kaido have high hope for yamato to become shogun of wano. I guess kaido makes her learned something like a leadership. So be it. Yamato role will be strong shogun
What I really mean in here is
Army commander or maybe like grandfleet commander. It will be useful for final war that include so many people. Like I said she maybe learned something about leadership or commanding
Another possible role is a cannoner. Her attack does not feel like a slash but more like a
shotgun. I think she would cover more distance target bcs her attack is based on arrow (long range).
A shogun (army commander) that doing shotgun
My prediction is yamato's role either will be cannoner or maybe fleet commander