(TrendHunter.com) The Funko Pop! White Castle Slider figure is an upcoming collectible from the brand that's themed with the namesake QSR in mind to offer collectors an unexpected style to pick up. The figurine... (TrendHunter.com) The Funko Pop! White Castle Slider figure is an upcoming collectible from the brand that's themed with the namesake QSR in mind to offer collectors an unexpected style to pick up. The figurine...