Yasuke is actually a fantastic choice as far as history/narrative goes.
A shame the game looks like more generic Assassin’s Creed Mapfucking+Crowd Supermurder.
Which is fine if that’s your thing, but I haven’t been thrilled by an AC game since… well, AC1.
Tbh, even if I live character customization I don’t think it’s easy and affordable at all for a small dev. You have to make sure all aspects of the game adapt to the choice (models, textures, items, SE, writing and so on). Actually, I suppose it can significantly increase the cost of the project.