Private Leonard L. Church was a main character in Red vs. Blue and was voiced by Burnie Burns. He was the angry, de facto leader of the Blood Gulch Blue Team and was later revealed to be Alpha, the original artificial intelligence program created by Project Freelancer. Church, who has an irate disposition, was often used to advance the plot by managing the situation at hand; this in a way makes Church the main protagonist of The Blood Gulch Chronicles and the deuteragonist in Reconstruction. He is a minor character for the rest of the series with Epsilon taking his place and role, although he's referred to several times later and even returns during Season 14 as a supporting character.
At the end of Reconstruction: Chapter 19, Church is revealed to be based on the personality of the former Director of Project Freelancer, Dr. Leonard Church. The remaining part of Church was Epsilon who, like Church, was voiced by Burns and had similar traits, despite being a fragment.