lol, coincidentally there's a guy (who looks like a girl) in Gintama named Katsura.
Katsura: It's Katsura, not ZURA. Haha, couldn't help it, zura= wig/hairpiece, ah lame pun is lame...
Anyways, hell yeah, D.gray-man and Reborn! are both written by female mangaka, thus the girls are less than competent (Kyoko/Lenalee has useless heroine syndrome) and the plot reeks of yaoi. I think it was confirmed that Hoshino is confirmed to be female when she did a signing in Germany.