In events before the start of Guilty Gear, Kliff Undersn was the leader of the Sacred Order of Holy Knights and a hero of the Crusades. He was inspired to do great things for the world after almost being murdered by a rampaging Gear, only to be saved by none other than Sol Badguy. His gigantic sword, the Dragonslayer, was even given to him as a gift for his accomplishments during the Crusades. Kliff continued to lead the order until handing the title of leader to a sixteen-year-old Ky Kiske, leaving the protection of the world in the hands of Ky and Sol. Guilty Gear takes place five years after the Crusades, with Kliff living out the rest of his life in peaceful retirement. This is when he finds a flyer for the mysterious tournament. Sensing danger, Kliff enters the tournament to get to the bottom of its mysterious purpose.
Kliff Undersn is the typical powerhouse fighter of the game. His attacks deal more damage than the average fighter"s, but, as a balance to his extraordinary power, Kliff is an incredibly slow character. Trapping enemies in combos is no easy task with Kliff, but as long as you can stun the opponent or knock them off their feet, Kliff has some time to nail them with his next move. Also, Kliff does happen to have a couple of projectile attacks up his sleeve. He can launch a fire ball at the opponent (the level of the attack determines the range of the fireball) and he can even hurt the opponent with his taunt.
As an AI, Kliff won"t have much of a strategy besides slashing you into a corner with his powerful attacks. They shouldn"t be too tough to dodge, though, and landing attacks on Kliff shouldn"t be a hard job, either; Kliff can"t even dash.