Sugi's Neck

There are several easter eggs for vol 4, but I wonder if the constellation on Sugi's neck is Cassiopeia, and the moles on his middle finger are a representation of Orion... also the hydra, serpent, venom theme was very present on Megi's hand tattoos...and if Utsugi is "your highness " and Aogiri is the "captain" there must be an ancient kind of vampires around, Sugi, Utsugi, Aogiri being the oldest ones so fast in the story.