It's a little bit odd to me that they would have some intelligence, and may be possible of speech. When they run, they look somewhat clumsy, and they look like they wouldn't have too much intelligence. One of them is a SoD, or so I'm assuming. In one of the trailers, I noticed character art for one of them. Maybe the dragon horses that have the red, blue, and black knights riding on them are stars, too.
"And as for the the end of the World, you need not worry. No one should worry about such a thing right now..."
-Leknaat, Suikoden IV