User blog comment:Uraharattack/Theories and Predictions, Round 2/@comment-7418318-20150628173425/@comment-7418318-20150630204257

I guess you wanted to respond to the comment-chain below ;), but I agree. Those, along with the looks, are the reasons why so any people think Serena is Yuriy.

I wouldn't put too much stock into the male or female name. Mavis was also supposed to be male, but Mashima learned that it was a female name and thus changed her gender to female at the last moment. ^^ Maybe he just made another such mistake, but with him appearing right in the next chapter, there was no time for corrections.