Chubby is about fullness across the whole frame. The appeal comes from softer lines, rounder curves, and a body that reads as fuller overall, not from isolating one feature such as bust, hips, or thighs.
The category lives in overall shape. Arms, waist, hips, legs, and the transitions between them all contribute to the impression. That makes Chubby broader than a bust-size or backside tag, because viewers are usually looking for softness and roundness through the full silhouette.
Rounded contours, visible softness, fuller proportions, and movement that shows body fullness are the usual signals. A strong match should feel consistent across the body rather than depending on one isolated curve or one flattering angle.
Big Tits focuses on bust presence. Petite focuses on compact scale and a smaller frame. Chubby is about fuller, softer body shape overall. A creator can have a fuller bust without fitting Chubby, and a smaller body can still be Petite without rounded fullness.
Use the category when you want a softer full-body look rather than a single body-part filter. Previews that show the full silhouette are the most useful. The best matches make overall fullness feel central, clear, and respectfully presented.