I think it's Shiki's father, his design is a mix of western and eastern, it's same goes to his swords half katana and blade. Somewhere in the past before the Oden/Kaido period, a western dude with blonde hair voyaged to Wano, unfortunately their ship crashed, he wondered around defending the shore from bad people, so the local gave him the title of hero. Later they settled down with the local women, the woman gave birth to Shiki who has both western and eastern heritage.