Kingdom of Dragon Pass / Six Ages is pretty niche and the lore there basically has people larping so hard to re-enact divine stories that the divinity rubs off on them and gets them magic and neat stuff. Or terrible deaths.

Ex. head of the Orlanthi pantheon in myth slays a dragon to rescue a rain god inside it and end a drought:

The “We have that at home” version:

(They have even larped as cows… that one’s on the dangerous side though…)

I bet The Owl House would work great. Fun, weird, inclusive, magical, fantasy world that is parallel to ours. In a similar direction: She-Ra and the Princesses of Power.

To larp? How do you larp niche media?

The PS3 hit, Fat Princess.

Cool fantasy setting, much fighting, clear objectives (princess kidnapping) - perfect LARP stuff.

Plus whoever is the princess gets to be fed cake all day.

Dungeon Crawler Carl comes to mind. If not Carl, one of the many other character from the same books.