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Name: Lillian

Species: Mutant Mermaid Shapeshifter

Nicknames: Lily (Only her sister, her friends and Raph call her Lily)

Status: Alive

Age: 16-18

Crush: Raph (Boyfriend)

Friends: ROTTMNT Allies

Enemies: ROTTMNT Enemies

Family: Michelle (Best Friend and Adoptive Younger Sister)

Appearance: Short blue hair with light red hair streaks, light green color eyes and wears a royal blue long sleeve shirt underneath a light red overall dress, black tights, light red converse boots, a light blue crystal pendant, light red and light blue ear cuffs, navy-blue and mint green striped armwarmers, a light red satchel and a dark red zip-up hoodie.

Mermaid Kunoichi: Has her short blue hair in a small ponytail and wears Cure Beauty's outfit from Smile PreCure, light blue and silver earcuffs, a light blue crystal pendant, a light red satchel and sometimes wears a gray cloak.

Others: When she's in water she turns into a mermaid and when she's on land she turns back into a human. Her powers are siren scream, ice and water powers.

Sounds like Selena Gomez