Serenity Heller is the daughter of Mordecai Heller and Jenni Graves.

Appearance:
Serenity has black and white fur and light blue eyes. She has black spiky bangs like her mother. She doesn't wear glasses, but her eyes are sensitive to light.

Childhood:
Serenity was born June 8th, 1929. As a baby, Serenity was like any other normal child. She enjoyed reading and often discouraged war and violence. Serenity began school alongside her brothers and sisters at the age of 5. Serenity was the most intelligent out of her family and enjoyed learning new things. Instead of bedtime stories Serenity asked her father to teach her math before going to bed. She hated picture books and only went by novels and math books.

Growing up, Serenity knew college level math and reading levels by the time she was a teenager.

Time at Lackadaisy:
When she turned 14, Serenity is allowed to come into Lackadaisy. She is named the heiress and next in line to take over Marigold as she is Mordecai and Jenni's first born, despite being a result of triplets and the most intelligent out of her siblings. She is also an heiress to the Graves family fortune as her mother is a Graves.

Personality:
Serenity is a light-hearted, bold, and fearless young cat. She is also sassy and has a sharp tongue. She is very friendly and goofy at times. She has a close relationship with her father but shows a slight fear of him as seen when she is practicing her shooting skills with him, Nico and Serafine invite her to shoot at a real duck in a cage (she was originally shooting at fake ducks). Her father is alerted to this and immediately snatches the gun from her, scaring her and causing her to recoil, and taking her home.

Regardless, she is the closest to her father out of her siblings.

Abilities:
Serenity is highly skilled in marksmanship and hand to hand combat.
She's also extremely acrobatic and agile.
Serenity is skilled in cooking and gardening.
Serenity is also a skilled musician. She's also a good singer and dancer for someone whose parents don't do much of either.

Trivia:
Serenity's full name is Serenity Isaac Heller, getting her middle name from her paternal grandfather.
Serenity's favorite drink is tea.
She is the smartest out of the Lackadaisy kids.
Serenity seems to have a sixth sense as she can sense when something is wrong before it happens. A trait she gets from her mother.
Like her father, Serenity's ears are almost always pointed back.