Eldest son

The oldest of all the "The Children" and their leader. He was apt at social graces. When bound and de-powered he still managed to learn secrets of the group and attempt to sew the seeds of distrust. From his own accounts within the interrogation he admitted to posing as the lookalike to Dr. Elijah Heartman  who asked Hadley Messer to "save the last dance for me." He also claimed he could not keep his agreement to stay away from Dr. Heartman if he came after him. Whether these are true accomplishments or things to throw off the group is uncertain.
From reviewing Eric's video recordings he was found disagreeing with 2nd oldest son on how to deal with the club and their activities. He did not feel the security breach was an issue after capturing the saboteur and that this would only "add to tonight's entertainment." Where as the 2nd oldest felt they should hire a technician to see if they could recover the lost data and find out if others were involved.
When he was captured he was watching an arena battle until the lights went out. He seemed to be thriving off the emotions of the fighters. Whether his plans are over now that he has been turned over to "The Parents" , only time will tell.