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Red Ruby is, without a doubt, the girliest of the Seven Mermaid Princesses. She is very concerned about her appearance, often looking at herself in the mirror. She is a very confident person, but that can lead her to be spoiled, arrogant, and condescending at times, mostly towards Purple. She also has a short temper and hates being humiliated, especially in front of large crowds, though she is very sweet and caring to those she holds close to her heart.

She has fair skin, pinkish-red eyes with pinkish-red hearts and long pinkish-red hair, In her human form, she wears a pinkish-red headband on her head, a purplish-red dress with a white outline underneath her pinkish-red vest, a red heart choker, purplish-pink leggings, white socks and purplish-red shoes, In her mermaid form, she wears a gold tiara, a pinkish-red tank top with a red heart and a pinkish-red mermaid tail in a shape of a heart.

In her magical girl form, she has rainbow in her eyes and she has pink and yellow highlights on her hair. She also wears a pinkish-red cap on her head, a pinkish-red dress with a rainbow heart, pinkish-red gloves and pinkish-red boots with thick rainbow outlines.

Heartcon is Red Ruby's fairy pet. Heartcon is a seahorse creature with light pinkish-red skin with a pastel pinkish-red heart on her stomach, pinkish-red hair and pinkish-red eyes that have hearts in them.

She's friends with Six other Princesses: Purple Star, Yellow Gold, Green Leaf, Blue Sapphire, Orange Amber, and Indigo Keen.