TAO was Cerean scholar who travelled the Galaxy following the end of the Clone Wars. He became very interested in the fate of the Jedi and began to study planets that were strong in the Force to discover their whereabouts. On a trip to Korriban TAO stumbled across the Sith Temple. Believing it to be deserted he delved deeper but was eventually confronted by Darth Levid. Instead of killing TAO though Levid brought him before Nihilus who allowed Levid to take the Cerean as his own apprentice.
This is good, however i have to be honest and say i'm not a fan of defacing lego, i used to do it when i was young and now i really regret it. When i got my Lego out from my very long dark age i had to throw a whole load out that had been chewed, cut and drawn on. I hope you don't take offence ;-)