User blog comment:IamJakuhoRaikoben/Sorcerer Magazine, Issue 30: June 2014/@comment-121.54.54.55-20140702083655/@comment-1776824-20140702150530

It's either Yuri or Yuso; one of the two. ( .__.) And that is most definitely Makarov's dad, considering it says in the box "Makarofu no chichi", which is "Makarov's dad". :D *hopes that it will be taken up by Stream or someone else* ( -__-)/