What's the category name for business "mascots," i.e. Ronald McDonald, Jolly Green Giant, Michelin Man, etc?

We want to have a costume party and for this years "suggested costume theme" we want it to be advertising/spokeman's used in ad campaigns. Like the Geico Lizzard, or M&M's or the Maytag Man. We don't know what to call this theme for the wording on the invitation. Thanks!