As said, Ralf and Clark have been partners for a long time, and accomplished a lot of missions with unarguable results. Their combination of power and intelligence represent a threat for criminals and corrupt politicians alike. While Clark loves to use guns, Ralf prefers the down-and-dirty work of his knives to get the work down. He has also been very skilled in the uses of punches and close-contact moves, even being able to move his arms so fast and so powerful that they create explosions upon contact!

During a mission, Ralf and Clark had to penetrate the Amazon jungle to destroy a local weapon warehouse. Upon completion of the mission, Ralf and Clark had noticed that they were left in the jungle. They kept walking (and Ralf, unfortunately, had to trip with a couple of snakes on the way), until a helicopter located their position. Then, their commander, Heidern, leaped out of the helicopter. He tells his two most effective mercenaries that he needs their help to take out Rugal Bernstein, a criminal merchant and a menace for the world governments. He also happened to kill Heidern's family awhile back, so it was also personal for Heidern. Both mercenaries accepted, and thus began the adventures of Ralf and Clark in the King of Fighters tournaments. Ralf was much more enthustiatic than Clark, since Ralf always seeked a good brawl wherever he went. Ralf also respected Heidern a lot, not onyl for being his superior, but also his master and the man who trained him in combat situations. He helped Heidern up until Rugal's death, and then, one day, Ralf was called to Heidern's office...

Clark was there as well, and Heidern began to speak. He says that the King of Fighters tournament is coming up once again, but this time, he won't be coming along. Rugal was dead, so Heidern can finally sit back and rest, but he would not leave them alone, of course. Heidern then called Leona in. Ralf was astonished as his new partner was to be a woman! And a very tomboy woman at that...Ralf decided to protest very harshly, but Heidern did not pay too much attention, and only tells Ralf: "Don't underestimate her until you have seen her in action.". Heidern then briefed the trio of their new mission: to track down Geese Howard, main mob leader of Southtown, and investigate his intentions of entering the tournament. If his actions represent a threat for humanity, then they were ordered to stop him. Ralf accepts for Heidern's sake, but still has his doubts of Leona. Although, he has this strange feeling of respect towards her as well...

Ralf investigates Geese as ordered, but finds out a lot more things about Leona as well. As Ralf knew more about Leona, more he became interested in her. Then, Heidern calls the Ikari Warriors and orders them to reunite in the stadium to keep an eye on the final battle. As soon as they arrived, a huge gust of wind blew and destroyed the whole stadium. Ralf then saw a tall figure amidst the rubble. He said his name was Goenitz, but that wasn't the most surprising thing he heard: when Goenitz confesses that both Iori Yagami and Leona are of Orochi blood, Ralf is more than surprised. Once Goenitz is defeated, Ralf decides to comfort the confused Leona by doing a funny scene with Clark. This manages to cheer Leona up, but Ralf knows things would only become harder from now on.

By next year, Ralf had to almost abort a mission due to Leona's flashbacks of her past in the middle of a mission. Ralf then asks for Heidern a temporal suspension to enter the King of Fighters tournament, as a mode of distracting Leona from her bad memories. However, the worst was yet to come. In the final stages of the tournament, Leona enters the Riot of Blood, and then goes out on a killing rampage. Worried for his friend, Ralf takes Clark and decides to go search for Leona and stop her. They manage to stop Leona, but after the sealing of the Orochi power for good, Leona decides she is too dangerous to be allowed to live, and is about to pierce herself with her blade hairdress, but Ralf stops her, and tells her that she was alone before, but now she had her friends to look up to. Then, Ralf gives her his headscarf, and all three friends walk back looking towards a new future.

Ralf feels kind of relaxed once the fights are over, and back in the life of mercenaries along with Clark and Leona, taking some extreme missions. While none of them even got close to the experience of Orochi, Ralf is relieved to see Leona a little bit more calmed down, and of course, always trashing the house with Clark! The happy times don't last forever, however, as commander Heidern informs Ralf about the new King of Fighters tournament, and the urge in investigating the evil intentions of the host this time around. He also gets to have a new member with him: the female mercenary, Whip. Ralf accepts, but begins to wonder if the Ikari Warriors have became a women's club....

But the danger is not over yet. The NESTS cartel, the organization behind Krizalid, was still at large, and Ralf had vowed to stop them. Along with his commander Heidern, they analyze the next objective: it seems that NESTS was last located at Southtown. Heidern assigns his mercenaries to the attack site. Heidern would remain with his fellow commander Ling and supervise the mission. As the field leader, Ralf sends his comrades out.

Upon arriving at Southtown, Ralf orders a scouting. Nothing has been found yet, but once a building begins to shake in the horizon, Ralf senses something ominous. He rushes his partners to the abandoned factory, were he found his commander Heidern wounded. It turns out to be that Ling was actually Zero, a high ranked NESTS agent that assumed Ling's identity. Too occupied evacuating the buliding, Ralf notices that Whip is amiss! Before he can get into action, Ralf has to retire in order to avoid the inminent impact of the Zero Cannon.

After scouting the area and finding no trace of NESTS whatsover, Ralf goes back to his headquarters with a feeling of defeat. Back in the base, Ralf is summoned by Heidern. He has a gift to give him, Leona, and Clark. Whip actually left a video before the mission. In it, Whip bids the mercenaries farewell, and acclaims their big feeling of friendship, and begs them not to miss her. Ralf wonders if it's too late for that....

During the next year, Ralf commands the Ikari Warriors into investigating several locations were NESTS is supposed to have operation bases. However, by the time they arrive and raid the places, they are already empty, with no track of NESTS ever being there. Ralf starts to get incredibly frustrated until Heidern orders the Ikari Warriors to a new task: to enter the next King of Fighters tournament! It seems that NESTS has finally decided to go public as the tournament host this year, even after they destroyed Southtown with their Zero Cannon. Ralf knows that something just isn't going right, but is surprised to know that the one who gave them this information was Whip, with whom they had lost all contact for a whole year. Ralf knows he must make it up to Whip by trashing those losers at NESTS!

Ralf fights with all his might in the King of Fighters tournament, but this is yet a decoy to foil the possible NESTS spies. What Ralf really aims is to find the secret hideout of NESTS. Thanks to their contacts, Ralf now knows that the main location of NESTS is in outer space, in a space station. Ralf leaves the task of defeating NESTS up to Whip and company, and watches with joy how they managed to accomplish the mission by taking NESTS down. Not long after, Ralf and his partners are assigned to another mission, but along with him, he takes a recent photograph of Whip, who seems to be going along just fine with Kula, a former NESTS bio-weapon. Ralf knows Whip must understand Kula very well, since it was confirmed that Whip was also a clone created by NESTS. But Ralf knows how strong Whip really is, and says to himself: "Keep it up, you dominatrix!"

Ralf is sort of cocky, unlike his serious partner Clark. However, when paired up together, this duo sort of does the most loony things! However, that doesn't mean Ralf doesn't take the missions seriously. He is aware of his responsibility, and will do anything to get the mission done. He cares a lot for Leona, and seems to like her, but doesn't want it to be revealed. So, Ralf decides to be a counselor for Leona, and help her pass her crisis.