Uragnites are also in Dynamis... I want to say Buburimu? Not sure. And as for Living Crystal, it's the ACP final boss... it's meant to be unique. Riko Kupenreich was also a unique monster. So's Promathia. And Alexander.

But anyway, I do agree with most of what you're saying. There's a lot of enemies out there that I would love to see more of.