They're the first spirit we've ever freed. The spirit that taught us skykids how to free other spirits and gave us our first hairstyle outside the one we were born with, without even asking for hearts in exchange. They're the first spirit any moth will know, and out of the whole rotating cast of spirits to visit aviary, they're the only one that's there every day. They're the one that greets us when we enter the village, making us feel welcome just like they did when we first started playing the game.