Lapis is a Russian Blue cat Jewelpet with blueish-gray fur and cyan inner ears. Her eyes are dark azure lapis lazuli gemstones, reflecting her jewel motif. She wears a gold beaded bracelet on her left paw and a gold collar featuring a large, tear-shaped lapis lazuli jewel.

Her abilities embody "Strong Fortune" and the "Destruction of Evil," using magic to bring luck, increase human fortune, and vanquish evil forces. She senses individuals' moral alignments, as shown when identifying Dian's malevolence. These powers fall under the "Magical Blue" attribute, enabling object manipulation. Personality-wise, she displays maturity and snarkiness, with interests in horoscopes and stargazing for fortune-telling.

Across the franchise, her roles shift:
- In the original *Jewelpet* series, she belongs to the elite "Jewel Eight," defeats Rinko in the Jewel Games, and temporarily aligns with the antagonist Dian. King, her romantic interest, joins her out of affection before both escape Dian's influence.
- During *Jewelpet Twinkle☆*, she briefly appears at a sports festival, predicting Ruby’s outcomes through fortune-telling.
- In *Jewelpet Kira☆Deco!*, she runs a mature-themed bar in Jewel Town, frequented by patrons like Coal, Io, Kaiser, Blue, and cursed Opal. Blue calls her "Mama Lapis" for her nurturing bartender role, and she acts as a confidante for Kaiya, who shares fashion insights.
- For *Jewelpet Happiness*, the Red Moon possesses her in episode 31, making her mean-spirited. She captures and tickle-tortures characters like Ruruka, Sapphie, Chiari, and Ruby. Her arc involves a romance with the school nurse, creating a Magic Gem together. Ruruka Hanayama helps restore her by rekindling memories of the nurse’s love.
- In *Lady Jewelpet*, she appears in a cameo alongside Peridot, Jasper, Nix, and Luna.