Shouldn't we post what exactly is the relation between NPC and main char?
Also, are we still going with the idea of playing out an alternate version of the history of the galaxy, or is it going to be more normal also?
Name: J.D. Cox
Hair: short, black, thick
Eye Color: green
Appearence: Good looking, agile
Bio: More cautious than most, but playful. Suspicious of most people but acts casual. Fun-loving but thinks before acting. Paranoid and emotionally traumatized.
History: Lived most of his life on Corellia, during his early half he was raised by his parents. His father who was rich and prominent businessman, he lived in comfort. His father taught him how to ride speeder bikes, which had been an old habit of his.
When he was twelve his parents were killed in a speeder car accident. Unfortunately he was conned out of his fortune by his father's business partners and rivals, who had decided to ally together to take over the family fortune for themselves. JD was left to fend for himself on the streets. On the streets he learned to fight, and became tightly wound. He finally ended up becoming a thief, stealing valuables and spending them on food and pleasure. He also raced his speeder bike as an alternate source of money.
He was found by a jedi named Rih after seven years of living on his own when he tried stealing his lightsaber. This resulted in a chase where JD was almost killed, and the jedi finally sensed that JD was not a malignant thief, but only someone trying to earn extra cash for living and the fact that he was force-sensitive. He finally cornered JD and gave him a choice, stay on the streets, or go to the jedi academy, where he would at least have the guarantee of food every day during his training.
Bio: Rih Dixon, 51. A jedi trained since birth, he was raised to be compassionate at all times, and is famous as one of the wisest jedi, he never uses force unless all other avenues of negotaiation are gone.
Vader's wife was very pregnant when she died 19 years ago. All of a sudden a 19 year old who is very strong in the force and has a distinct resembalance to him in his younger days rolls in from Vader's home planet with his old Master Obi-Wan (Who was the ONLY other person preset at the time his wife died. And to boot, the kid's last name is Skywalker.
So in answer to your question, he knew Luke was his son because his name is Darth Vader, and not Darth Retard.
-Forum post on why Vader knew Luke was his son.