Funko's Pop! Vinyl line are figures modelled in a style similar to the Japanese chibi style. The figures have large squarish heads, disproportionately small bodies, and large, circular black eyes. The figures typically depict licensed characters from franchises such as Doctor Who, Marvel, DC, Disney, Star Wars, Wizarding World, and other pop culture entities.
A chase variant is any Funko product within a series that is a rare variation on the original mold, originally at a ratio of 1/36 that has since increased to 1/6. This variance can be as simple as a color change, or as complex as a totally new mold. Common variances include different molds or character poses, a flocked (fuzzy) finish, metallic paint, glitter, and translucence. They are randomly inserted into shipments. Also, some chase variants have the character without their suits or with their suits if they are a superhero. Wikipedia