Not too far from the truth. Dullahan are the beheaded heroes that were basically the best humanity has to offer, so it stands that if you juice them up with huge amounts of demonic energy, they can take the super soldiers of Heaven and Pandora.
If you're lucky it's my one and you can probably bribe her. but more likely, it's not. Don't worry just knock her block off. This never ends badly ever!
The Order and the Magi are allies (though their alliance is shaky). As Aiden has observed, the Magi view mamono as pets at best. Those who ally themselves with demons are still very much heretics.
She's a species brought into existence to act as Baphomet and the Witches servants. After a time, they were picked up by other factions who possessed weavers, including humans, who needed something to perform various simple tasks for them.
The Familiar has already been translated, but it's of content I'm currently not allowed to endorse here, so it shall be ignored while I keep my own non-pedo version.
Has anyone read this yet? I thought it was rather good. Not quite sure if it counts as monster girl or not, but it has a goblin girl in it if that counts~