Can Siren Mermaids Shapeshift In Legends?

Chloe is a scientist with a secret, she is a mermaid...without a mermaid, or so she thinks. She is a hybrid, half human and half mermaid whose father is disgusted and left her mother when he found out she was pregnant. With the help of her best friend Kari, who finds out she is Royalty in the Werewolf Kingdom, she finds herself fitting in with the Werewolves when the King of the Sea finds her. He is disgusted with her father for abandoning her and pulls her into their world along with her werewolf mate but she finds out that she is special and she is hunted for her mermaids scales

"Cry, Mermaid!" a sharp lash sliced into my back, forcing a yelp from my lips. Screams and sobs surrounded me on all sides, but no one would save me. Strong hands caught me beneath my arms and yanked me from the water. It was time for Tail Cut. The operation lasted hours. I felt every last slice of their blades, every new tendon sewn into my muscles and nail hammered into my bones. I screamed. I begged. I begged for them to stop, for them to kill me, just ended the pain. --- I have a secret, I am a mermaid. I should live in the ocean, but my tail was cut and I only owned legs. After escaping to Asterion, I hid my identity. I thought I could finally live a peaceful life, until that day I met the famous bad boy, the future Alpha, Caspian. --- I felt a strange prickling on the back of my neck. I spun around just in time to see Caspian prowling towards me through the darkened wings, his blue eyes positively glowing. Sharp white teeth flashed as Caspian's lips unfurled into a lethal grin, "Hello Mate."

My sister has awakened her mermaid bloodline, but it is incomplete. Her skin is her curse. A single touch, too hard, and it cracks. For her, everything hard in our house has been thrown away. I love to dance, but the hard tips of ballet shoes are forbidden. I love music, but the strings of a guitar or the keys of a piano are too dangerous. Every dream I've ever had has been strangled in its cradle because of my sister's condition. My brother, Liam, who raised us both, always looks at me with tired, pleading eyes. "Elara is fragile, Isla. You have to be understanding." But I was only eighteen the first time I truly understood. I came home from my high school graduation ceremony, the scent of sunshine and excitement still on my clothes. The moment I stepped inside, Elara's hand connected with my cheek. Hard. For no reason at all. Everyone rushed to her. Liam pointed a furious finger at me. "Look what you've done! You've hurt her hand! How could you be so careless?" He shoved me aside and rushed out with Elara to find a doctor. I fell back against the glass coffee table, the impact jarring. And then, a strange, cold pain bloomed across my back. I felt my skin... tear. It was then I remembered the doctor's words from my last check-up: "You carry the Siren's Gene, Isla. It could manifest at any time." As my vision blurred, my own blood pooling on the pristine white floor, I finally understood. The curse wasn't just my sister's. It was mine, too.

Aiden Atkinson, a rejected Alpha werewolf, searches for a life of meaning; when he stumbles upon Kayla Lawson. He soon learns to love and trust someone new in his messed up life. Kayla Lawson, a broken young woman, has an identity crisis and discovers she is a mermaid. When the war between werewolves and mermaids is revealed to Kayla by Aiden, she must decide to tell him who she really is and risk their new relationship. As she begins to make amends with the death of her parents, Kayla finds herself drawn to the ocean by a mysterious voice calling her into the depths of the ocean. Perhaps these voices can help Kayla make sense of the world around her.

Charlie is a member of Black Diamonds, they hunt for these inhuman beings called mermaid. When the ship is attack one night, Charlie is pulled into a whole new world under the sea.

Fairytales don’t always come from the earth... until her. 
 Mermaid legends are human fables, but beneath the waves, war is looming. A missing daughter is the only hope for a dying species. 
 Rescued during a typhoon, Galene finds herself in a new world amongst a dangerous species—humans. With no memories of her watery pasts, she doesn’t see the predators closing in until it’s too late.
 Stralath is a shape-shifting bounty hunter dedicated to keeping the peace in a violent universe. His earthly mission? To find the elusive mermaid who he’ll dangle in front of a dangerous oceanic pod.  Except Galene is not what he expected—she’s an innocent caught in a dangerous game of extinction. An angel who paints with color and smiles at the world.  She is easy prey, and Stralath abandons his mission, unleashing his brutal self to guard her heart and life.