Regarding Ariel, she might have the ability to transform from a mermaid to a human on dry land (like she did in the CC promo and like the mermaid in the film “Splash”). If so, then Ariel’s fin might transform into a skirt magically for the sake of modesty, instead of her just ending up naked every time she comes ashore.
That would make a lot of sense. So we see her pop out of the water as a mermaid and then she becomes human as she swims toward land.
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"He was a lot of things to me" "The only conclusion was love"