There's always more Mili bangers to discover, huh?
About 4: Ohh! Extra mermaid lore! Thanks!
About 3: No yeah, I totally see that's what the story says. I mean, if Perle were a mermaid, someone would probs recognize her? Unless she were from a different kingdom... A-Anyhow, they're just headcanons, there's nothing in the story that really mentions it or anything I just made it up