Sixteen year old girls named Marina who have a brown skinned black girl who has brown eyes she is stubborn, never wants to see a person she dislikes hurt depending on the situation and she is really caring kind and loyal to her friends and family, her mermaid form is pink scales and same with her human siren form. A girl named Oceana who has black short hair, blue eyes, and she is really shy sometimes, clumsy, loves the sea animals, and will defend anyone even though they bully her or treat her badly her mermaid form is blue scales and same with her human siren form. A brown skinned black girl named Athena who has brown hair and brown eyes she is really stubborn, once someone betrays its hard for her to act the same with the person, will fight you if they threaten to fight her or touch her her mermaid form is orange scales and same with her human siren form. Marina and Athena have been best friends since 6th grade. They met Oceana in 9th grade, Marina has a pup dog named Skye who can turn into a merdog and the symbol shows she belongs to the royals, Marina is the princess of the merfolks, Oceana has ice and water powers, Athena has fire powers

Adella told the girls that they can try seeing what life is like in the human world and to see if anything unusual is out of place, Marina and Oceana were excited but Athena hates humans so much because a human killed her mother a few years back so she wasn't really looking forward to it. When they arrive a few weeks later they are staying with Marina's mother friend Rita and she has a son named Miles who is there. He has red hair and red eyes like Rita and has a huge crush on Athena. Rita home is like a mermaid home when you walk in her living room and you see a book shelf and then you enter a whole different section of the house, its like a cave and you walk down stairs where you see a huge pool that leads to the ocean. Rita told the girls including her son that Hudson in their school is a hybrid merman. Oceana looked confused then asks

Oceana: what's a hybrid?