User blog comment:KressKross/About the redhead in Sun's team/@comment-2006510-20140621105029

I believe there was a fanart that had that same guy going 'I am not a girl!' or some such XD

But yeah, while the chest is kinda unclear, look carefully at the hips - fairly straight, and don't stand out at the sides. If he were actually a girl, they'd likely be more prominent - but it also doesn't help that his shoulders (which guys are broader in) are hidden by the stance :P