Books like Mermaid Friends (Not Quite a Mermaid #3) by Linda Chapman

A middle‑aged man returns to his childhood home, where memories of a magical girl and a mysterious farm haunt him, revealing a dark, supernatural mystery from his youth.

Merliah, a Barbie character, discovers she's a mermaid princess and embarks on a journey to save her mother from evil.

Emily Windsnap, a twelve‑year‑old with a mermaid half of her genetics, discovers her true identity and battles a legendary sea monster that threatens her family and friends.

Electra the mermaid and her friends form a treasure‑hunters club, only to be stung by purple jellyfish. With a tiny dwarf seahorse's help, they navigate lost waters, uncover a hidden cave, and discover a special surprise.

When Echo injures her tail, she can’t compete in the Poseidon Tail Flippers team competition. Will Echo find a way to help her team win from the sidelines?

In the scorching desert world of Mirage, ocean‑dwelling friends Aluna, Hoku, winged Calli, and Equian exile Dash must outwit the tyrannical Karl Strand and his clone Scorch to save the Equians and prevent the desert’s collapse.

Best friends meet the sea, but the school's snobbery ruins everything as Shelly and Echo face a new challenge: schoolwork.

Electra, the nine-year old mermaid with legs instead of a tail is back and in search of even more adventure! It's New Year on Mermaid Island. Every year a young Queen of the New Year is chosen and Electra is desperate for it to be her! So she might get chosen, Electra and her dolphin friend, Splash, decide to swim over to the grotto to help the grown-ups decorate it for the New Party. But Electra and Splash get carried away and make a BIG mess in the grotto. Sent away to behave, the two of them discover tunnels at the back of the grotto which lead to the deep sea. All the tunnels are safely blocked up except one. Electra and Splash try and tell the adults but they are too busy fixing the mess to listen! So when a group of sharks swim down the tunnel and threaten to eat everybody it's up to Electra and Splash (and a giant ink squirting squid) to save the day!