Liren was Number Four's father and husband of Lara. He was described as being brave and powerful, he lived his life with integrity and purpose.
Not much else is known about him, though despite the fact that Liren was supposed to be away developing his legacies, he visited his son regularly. He was also good friends with Six's parents Lyn and Arun.
Four sees his father, recognised by his distinctive silver and blue Garde suit, in his visions on many occassions. He witnesses one of his fathers visits where he lifted his son off the ground with Telkinesis while he was playing in the garden with Hadley. During the Invasion of Lorien Four sees his father create a thunderstorm to kill a Piken.
He fought courageously but eventually died fighting the invading Mogadorians on Lorien. Four saw visions of his father fighting as well as his body amongst a pile of the dead.