Okay so the art book is out. There are all the watchers from the game.
Ezrael is a fucking Wyrm from the first Drakengard. That’s why it does way more cool stuff than everyone else. Also Four found herself a black dragon like Gabriella and lobotomized it like one did with Gabriel. Five is a horrible person (for more than one reason) for trying to kill and eat a crab that looks like Phanuel.