Song of the Sea and Ingo
A crossover AU where the Ingo characters take the parts of the characters in Song of the Sea; but they still retain their personalities they have, so the story would go differently, and it's Mer instead of Selkie (a cloak that becomes her tail can be the thing she needs to survive). With Sapphire being the part Mer, Connor her big brother, Mattew the Mer who has to abandon his family, Sapphire and Connor's mum as the parent who has to raise them and keeps Sapphire's heritage a secret, Granny Carne as the grandmother who takes them to the city, etc.
