Name: Arina
Age: 18
Looks:

Tail:

Friends: Nixie, Evie, Mimmi, and Lyla
Family: Sirena and Aquata
Crush: Zack
Enemies: Cam and later Erik
Likes: Swimming, using her powers, and seeing her sisters
Dislikes: Selfish or evil people, people who want to get rid of all mermaids
Backstory: She's Sirena and Aquata's sister. She stayed on Mako Island for her sisters and hasn't really left, but she eventually leaves with her sister and everyone after Cam's plans are thwarted. Though, when Erik tries to destroy Mako Island, she returns to protect her home.
Other: She stays on Mako Island until season 4.