I haven't received them yet, but I think that they will look extremely good on Hoshidan Xander. I imagine that he'll look like a weird hipster with them, with his robe and the sideways mask.
Biggest problem is that I've got a lot of other anti mage options (Flora +atk/-hp and Innes +res/-def among others)
Well, Halloween is getting close, so it might be fitting to use her now.