Originally Posted by squeekness
I would think a helmet like that would restrict movement and make it hard to fight.
I'm not so sure. It depends how the helmet is constructed and if it's made to be somewhat flexible, but even if it's not it still look fairly faithful to the design of Samurai armour and they're generally built for purpose. I think at worst it would only restrict his ability to look up and down if he needed to crane his head in those directions.