With how sebastian didn't knew ANYTHING about india's religion. Even though he lived for at least a hundred years - I fully belive that this bastard not that old by demon standarts. Something like 25 in human years.
He probably crowled out of hell. Made himself look like pretty white dude (so he wouldnt have to deal with racism or sexism) and just stick to Europe his whole time on Earth.
Which leads me to my even funnier headcanon. There ARE other supernatural creatures in the world. The bastard just never encountered them. Or they were smart enough to trick him.
On other hand - I headcanon Hannah so much older then Seb or Claude. She was in India, she was in Russia, she saw ancient Egypt etc.
So of course she know about other creatures. And of course told Claude and triplets. So they are all very casual about it.
Imagine sebastian taking Ciel to a plate date with Alois to the Trancy manor.
And Hannah and Claude are just there sweeping away thousands of poppy seeds in the garden.
Hannah looks up, apologetically smiles
"Oh, sorry. We just got rid of the Vurdalak last night. You know how they are"
And he doesn't. He fucking doesn't. Cause he's been a basic white boy his whole life. Assuming that some "people" don't smell like souls not because the don't have them, but because they are so bland.
He takes that as a joke and laughs it off.
And Hannah and Claude look at him like the idiot he is.
Like it's the equivalent of living today and not knowing Australia is a real place.
