Cinnabar has light red skin, a thick build, a large chest, and relatively small hips and legs. She has two sets of eyes with cherry red irises and black pupils. She has rounded light salmon hair and two bottom fangs. Her gemstones are embedded in her sternum and upper left palm.
She wore a sleeveless tri-colored bodysuit with a top maroon section with a red-violet star neckline. She had a bright reddish pink section on the left side of her bodysuit. Her third section is black-maroon with a complete right leg, and a cut off left leg resembling that of Ruby's shorts. Her right foot had bright reddish pink highlights on the toe tips and heel, while her left foot was split off into a boot with a bright reddish pink highlight on the toe tips.
She has a tight-fitting sleeveless maroon bodysuit with a large bright red-violet star in the center of her chest. Her star sections off a darker maroon section. She wears a pair of black-maroon armbands on her small pair of arms. Her leggings are also black-maroon and split off into a pair of reddish pink "boots".
Ruby and Ice clash on a lot of things. It's friendly but it can get a bit out of hand, and being Cinnabar isn't that fun for Ice; Cinnabar can be overly aggressive and a bit too extreme. Cinnabar has a superiority complex when it comes to battle, she believes herself to be unbeatable, despite being an unstable fusion.
Now, Cinnabar is more stable, but she's still a tad unstable.
Cinnabar possesses standard Gem abilities, bubbling, shapeshifting, fusion, regeneration, agelessness, and superhuman strength/durability.
As Ice likes Amethyst, and Opal even more so, and it is unsure how Ruby feels about Amethyst, but she doesn’t really get along with Pearl or she tolerates her, Cinnabar likes Opal. Opal and Cinnabar are both pretty unstable as it is, Scheelite, their fusion, is no exception to this but they are able to manage.
When asked who would win in a fight between Cinnabar and Jasper, GemCrust answered that Cinnabar would.
When asked would win in a fight between Kämmererite and Cinnabar, GemCrust answered Kämmererite, given that Cinnabar isn't good at using Ice's cryokinesis and Kämmererite is generally stronger and has a proper weapon.