Robert Joseph is a graduate of the Colossus program and was chosen to operate a Colossus suit alongside Alyson Hunter and Trisha Spring. Trisha says that he was the one Celis trained to activate Lucien's communications beacon.
Robert is quite a bit scornful and is prone to sarcastic retorts, poking fun at his comrades and generally failing to follow advice. He was a class clown that made jokes and poked fun at Navin Hayes, which caused Navin to not be very fond of Robert.
Robert was chosen as a graduate of the Colossus program alongside two other students. After their Colossus suit crash landed on Lucien, Robert immediately began to stray further from the group, and was abducted by a dark scout. Before completely succumbing to possession, Robert said of how he was trying to save their lives, and that they will pay and die. He attacks Alyson, but she puts him down. He urges them to run (Being fully possessed, not in power) and when they do, he is not seen afterward. He is probably still in Lucien still possessed by a Dark Scout.