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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: Teenager

Crush: Raph (Secret Crush later Boyfriend)

Friends: TMNT Mutant Mayhem Allies

Enemies: TMNT Mutant Mayhem Enemies

Family: Michelle (Best Friend and Adoptive Younger Sister)

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

Mermaid Kunoichi: Has her long blue hair in a braid 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 Sadie Sink