Yuri is rather emotional yet seen as a little evil devil within a little girl's body. She uses her piano to create a scary environment and to attract the Mermaid Princesses. Her piano playing also has the power to inflict mind-control on the humans, who will do whatever she commands them to do.
She hates seeing people happy when she is feeling down and usually will make them suffer by using her dark magic.
When meeting Hippo, she fell in love with him because nobody had ever treated her so kindly before, let alone give her a present. Despite the fact that Yuri knew Hippo was suppose to be her enemy, the two continued to see each other, creating a "Forbidden Love" between each other. The two usually met at the small beach storage house.
Yuri has long green wavy hair with a red and grey frilly headband and bright green eyes. She wears a rather formal and long red dress with a lot of ruffles and black and gray trims here and there.
In episode 25, she dressed up in a light yellow dress with red rickrack lace and she had her hair up in pigtails.
Yuri has a tendancy to dress up like the Mermaid Princesses and imitate them as well, as seen in episode 21 and at the New Year Party episode.
Yuri has the ability to control people and objects, especially with the use of her music and, if any, a nearby piano.
- Yuri means "lily, vibrate, and tremor".
- Yuri is the youngest of the Dark Lover group.
- Despite that Yuri is a water creature, she can't swim, as seen in episode 20.