Tbf, El technically isn’t a guy - he’s androgynous. But, since he was a guy in his previous life, it makes sense that he thinks of himself as a guy. He could totally play the part of a girl, though, and no one would bat an eye lol
A star of destiny? Really, and after all the crap's El has been through? Yup, calling El a girl is the quickest way to upset him. Given how fucked up the duke is, I wouldn't be surprised if he's a pedo, though he's probably just looking to kill the legitimate emperor.