Deng Qung-Fa was born with the proverbial silver spoon in his mouth. His family actually gained their wealth from a silver mine, and he was brought up in a variety of overseas boarding schools. Qung-Fa became elite and unrelenting, and when his uberhuman abilities surfaced he decided that he would become the greatest warrior on the planet. He became obsessed with martial arts, first pursuing Jujutsu, then Karate and Kung Fu and finally in Japan he studied Ninjutsu. His parents believed he was making business contacts and that he would continue the family business, but Qung-Fa was casting off his privileged upbringing and embracing the way of the warrior.

He clashed with the Fuchi-No-Kuroi ninja clan and almost died at their hands, but managed to escape using his extendable claws, which had remained secret during his training. He fled to China where he was welcomed back by Rat of the Immortals. It was 1997 and the Immortals were undergoing a change, phasing out the old and bringing in the new. After battling through a series of tests, Qung-Fa was chosen as the new Rat, and was established as the leader of the media-friendly Immortals.

He accepted his role as if he had expected it and assisted with the formation of the team. While an accomplished leader, Qung-Fa is distant, holding himself apart from his team, preferring solo sessions in the training room than spending time in the recreation suite.

Qung-Fa is a perfectionist, who holds himself far above the rest of the Immortals, and who particularly looks with disdain upon the female members of the team. He overlooks their accomplishments and comes down hard on their failures. If he had his way there would be no females on the team. He pushes himself relentlessly as well, and is never satisfied with his training sessions or his combat assignments. Deep down he believes he would be better served leading a covert team, perhaps even the Fuchi-No-Kuroi, but he lacks the warrior credibility to do so.

“Firearms are the weapons of the weak. If you can't smell the sweat and blood of your opponent, then you are nothing but a coward.”

Rat has enhanced physical abilities, particularly speed and senses; although his trademark ability is to extend razor-sharp claws from his fingers. In essence, his fingers elongate into rigid, sharp blades which he is more than capable of using with his various martial arts training.

Rat wears the standard Immortals uniform, with a Rat insignia and a mask to obscure his identity. He has spiked dark hair and a sinewy body which is the result of his ubergene and intensive physical training. Out of uniform he wears only black, and prefers form-fitting clothing that shows off his physique and allows him to manoeuvre without worrying about clothes.