Cliff is a 36-year-old Klausian and the driving force behind Quark, an anti-Federation movement—though his leadership role doesn't get revealed until later in the series. He's best known for his work alongside Mirage Koas, his longtime partner, and for being incredibly physically imposing; his strength and stamina far exceed anything you'd see from an average Earthling.
On the surface, Cliff comes across as all brute force and swagger, but he's sharper than he lets on. He's got serious chops when it comes to military strategy and political maneuvering, which surprises people who assume he's just muscle. Despite his intimidating presence, he's genuinely easy to get along with—not the typical hardened revolutionary you'd expect to meet.
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