I was actually thinking of doing Kotori, since I've been watching subs as they come out every week for the show. I like ZEXAL, but I don't know how recognizable the characters would be.
I think a lot of people in the YGO fandom would at least know of the series, but maybe not watch it, etc. It really depends on how appealing the show is, because I think this season looks to be (isn't, necessarily, but as far as style and characterization go so far) a little more kid-oriented than maybe 5D's.
Also, because there's a low chance of it ever being licensed, I don't think it'll be as popular here as it may be in Japan.
But in any case, I think cosplaying what you want to cosplay is fine. It's fun
and if it's not recognizable, I don't think it's such a big deal.
Hope this helped!