sydney tech journalist rae johnston is a passionate cosplay participant .
she wears her signature wonder woman costume to children 's hospitals and various pop culture conventions .
ms johnston will host the cosplay championships at this year 's oz comic-con - the official australian version of the san diego comic-con .
famous californian cosplay artist abby dark star will judge entrants .
over 20,000 people are expected to attend both perth and adelaide 's event .