IGA discussed that on a DXC development interview. He said he believes that is his evilness Dracula himself. Minakata further added that this detail is one of many "faithfully recreated" from the original version, probably meaning that this was intended to be a humanoid silhouette all along (though I'd agree with X here and say that there were better ways to convey a person). Minakata WAS involved with Dracula X back in the day, after all.