Tron

A fallen hero who was once the greatest warrior and protector of the Grid, Tron is now in seclusion after being deeply damaged in a battle with Clu. He sees Beck as a worthy warrior to step into his role and be his successor.

History
The original protector of the Grid, Tron was supposedly killed by Clu. However, Tron survived that battle with injuries. Unable to protect the Grid, Tron sought out a new protector and found Beck, whom he vowed to train.