It depends where you stand on the "Sex and Gender are Different" front.
If you think they're one in the same, then Sheik is probably a male.
If you think sex and gender are different, then Sheik is a girl, since Zelda only considers the Sheik persona a disguise and not her own identity.
***
I'm hoping Ruto and Darunia take influence from Link's mask abilities. Ruto with boomerang fins and electric pulse would be neat, and Darunia rolling around with spikes growing from his body is pure Dynasty Warriors.
If you think they're one in the same, then Sheik is probably a male.
If you think sex and gender are different, then Sheik is a girl, since Zelda only considers the Sheik persona a disguise and not her own identity.
***
I'm hoping Ruto and Darunia take influence from Link's mask abilities. Ruto with boomerang fins and electric pulse would be neat, and Darunia rolling around with spikes growing from his body is pure Dynasty Warriors.