Artimise said: wait a second, so he really was a girl in that state? I'm seriously confused now. So Alucard can change his gender at will too? How bizarre
It said in the manga that shape and form have no meaning to Alucard. He can appear however he wishes to. If that happens to be a teenage girl, well we already knew Alucard was touched in the head. From what I hear he did it mostly to screw with young Walter's mind.