Udo was the eldest of three sons. His father was the Jedi Master, Tor Loor, and his mother was a Jedi Mistress named Lai Viee. Udo was born into The Loor family, and famous Keldish family - known for their strength in The Force, and history with The Jedi Order. As with most members of the family, Loor and his brothers entered the Jedi Temple as younglings on their 4th birthday.
Udo moved to the Jedi Temple in 2454. Unlike most other younglings, he was able to see his parents often, as they were also Jedi. When he became 12, he became the Padawan of the legendary Jedi, Mortlock the Wise. Udo trained under Mortlock for another 9 years, before being made a Jedi Knight at the age of 21.
In 2487, Udo's brother, Nav, was killed whilst on a mission with his master - they had been tracking down a band of murdering pirates. This strongly effected Udo, and from then on, vowed only to use his powers for good. He abandoned his lightsaber, and focused solely on his connection to the force.