Ralf, and his fellow agent (and good friend), Clark Still, started out as palette swap characters in Ikari Warriors. In KoF '94, Ralf and Clark were very similar in looks and move repertoire, but by 1995, Clark got a newer stance and win pose, while Ralf retained his old ones. In every new installment of the KoF series, Clark seems to be further and further differing from Ralf; while Clark is a powerful grappler, Ralf is more of a power player, making use of some very efficient long-range attacks. Both characters were redesigned in KoF '99. He is also a playable character in Metal Slug 6, where he has the ability to use his punch to knock out vehicles and can survive up to two shots.