|“||There's so many stories where some brave hero decides to give their life to save the day, and because of their sacrifice the good guys win, the survivors all cheer, and everybody lives happily ever after. But the hero... never gets to see that ending. ...They’ll never know if their sacrifice actually made a difference. They’ll never know if the day was really saved. In the end, they just have to have faith. ...Ain’t that a bitch?||„|
|~ Epsilon's dying words in The End|
Artificial Intelligence Program Epsilon was a main character in Red vs. Blue and was voiced by Burnie Burns. Epsilon was created from the collection of memories of the Alpha A.I. and was used for the special operations program Project Freelancer. He was assigned to the Freelancer Agent Washington, previously known as Recovery One. Epsilon was also known as Epsilon-Church since after recovering his memories, he had recovered the personality and consciousness of Leonard L. Church, the original Alpha A.I. Because of his involvement, he could be considered to be the main protagonist of Revelation and the deuteragonist of Project Freelancer Saga.
When he was implanted into Washington, Epsilon caused him to see all of the Director's secrets, before "killing" itself, which possibly caused Washington to go insane. After these events, Project Freelancer decided to stop all A.I. implantation's; however, Epsilon would later be taken by Caboose after Reconstruction and be resurrected through his actions.
Unlike his fellow fragmented "siblings", Epsilon can show multiple emotions, possibly because he represents memory. Because of this, Epsilon can vary in different "forms", as he's been shown to take the forms of Alpha, Delta, Theta, Gamma, Omega and Sigma in a few instances. After Church's death, Epsilon took his role and became the main character in later seasons. Though he has Church's personality, he differs from him in several ways.
Being an A.I. fragment based on the Alpha's memory, Epsilon's personality is very similar to that of Church. However, there are some differences between them, such as Epsilon seeming to act more selfless than Church and shows more respect to his friends. However, Epsilon seems to have a larger ego, as he took great pleasure of being treated as a god by the aliens and even created a song about how great he is. Although Epsilon also has an angry personality like the Alpha, he seems to be calmer and shows regret for his actions when he loses his temper, most notably in Change of Plans.
Epsilon later acknowledges the Reds and Blues as true friends and in n+1. As he relives Blood Gulch with the teams, he even states that "If you have to live the rest of your life in a memory...You might as well make it a good one," implying that he may have appreciated 'his' adventures with them. However, it is possible that after Epsilon returned to Blood Gulch (or the equivalent) he initially expressed contentment, but then quickly changes his mind (e.g. Rounding Error).