She has long blonde straight hair, light blue eyes, and pink lips. She wears two pink bracelets, a pink top with lighter pink sleeves, a purple belt, green cargo pants, and purple heels with a pink colored heel and a pink cotton ball on top.
Little is known about Kelli's personality but it is safe to assume that she is a fairly calm and relaxed person. This is made apparent just in how she carries herself and it is also crucial to consider how she had to teach Riven how to play guitar in such a short amount of time given his usually impatient and rash demeanor. Despite this though, Kelli's teachings are able to get through to the hot-blooded Specialist, proving that she has the patience to be a capable tutor or teacher.
In "Secret of the Ruby Reef," Kelli can be seen playing her guitar at a party being held at Alfea. She appears to be very skilled as her guitar-playing garners her a lot of attention from those around her, including Riven. He is so interested in her guitar-playing that Musa begins to take his interest the wrong way and gets angry at him.
In "The Pillar of Light," she observes the solar eclipse in the courtyard along with the other students.
In "The Singing Whales," Kelli is seen out on the courtyard and Musa catches sight of her walking away with Riven. This causes Musa to suspect that Riven may be cheating on her.
In “Listen to Your Heart,” she is seen playing in a volleyball tournament.
Kelli may know some basic, first-level spells that all fairies can use, such as telekinesis, transmuting objects, and fixing minor messes. Her magic is light orange in color.