I really enjoy the shared headcanon that Hermitcraft is full of objectively terrifying powerful nonhuman legends that would all be massively OP on any other server, but on Hermitcraft everybody's just super blase about it because they no longer have a concept of normal.
Same!

Grian can time travel! Well he built a time machine once which definitely counts. And Iskall referred to villagers as his "family" at least once (and I think several times) so I like the idea that he is related to them.

I'd love to help more but it seems like we don't watch the same Hermits much. I also really enjoy the idea of Keralis of all people being the only "normal" one ^^