I’m not sure what “on brief for my character” means - yes, you can have something that works well with the character, but that’s pretty much a case of “this works with the theme I’m trying to go for”, there is no “brief” that your character has to follow. National costume briefs, on the other hand, are trying to put across a consistent look that the game designers would like you to go for.
Urizen may have “an Asian influence” but it’s in the Orientalist-mashup that’s come via, say, the Lord of the Rings film elves, rather than Japanese, Chinese, Korean or any other East or South Asian countries’ actual customs. So going for “this would be okay if I were playing a historical Japanese character” may actually steer you wrong in this case, alas.
I think what I’d ask myself before using that mask is “what am I trying to convey with this, and does that fit the cultural brief?”. Not just in terms of the look - is “I’m wearing a mask with a fierce face on it” something that fits in Urizen, not just for your character?