In most fantasy settings it's easier for a caster or ghost to poses something related, like a person with the same name or a relativ/ancester/decendant.
So your idea is sensible that Meko could be a Bull, (western) Dragon or demon.
Meko probably a bear due to a cutscene when you help Thane's dad cleaning the temple, the bear's name is Mikkel which pronounce just like Meko.
If what i wrote above true, Eyvind may will time travel to the past because Meko and his people were the the one live in that temple thousand years ago.
