Spinosita has very pale, pearl pink skin and sharp, dark fuchsia eyes with lashes surrounding the corner and bottom. She wears her fuchsia hair in pigtails with a flip on end, matching her short, two-layered forelocks. She has straightened, short cut bangs. At each pigtail are glittering pink quilled ears to match the quills on her back.
She wears a fuchsia dress with a rose design and white frilly collar, along with fuchsia shoes that have a ring of white around the top.
A little grumpy at first glance, Spinosita hides her sweet and gentle personality behind a prickly defensive outer-personality. She often spends her time daydreaming, but she is easily scared and will go into hiding if trouble arises.
- Her name may be based on the prickled spines of a hedgehog, and on the name rosita.
- Her color is based on a very rare, wild rose color.
- She shares this theme color with Siestina.
- Both girls have names starting with an S and ending with an A.