This characteristic is a "political" designation, not a species. A personnel is identified as a Founder in its name (card title). Although Founders are changelings (a species) and shape-shifters, the terms are not interchangeable. For example, Odo is a changeling but not a Founder. A card that refers to a Founder (e.g., "your Founder") means any Founder, not necessarily the card named [univ] Founder.