Xin

Xin is the Capo or Sub Leader of the Saint's Row and like Ayano has Died in a past life and reincarnated.

The One Behind The Order
Xin is commanded by Ayano Katagiri to kill Lunar because of being the "traitor" who is the reincarnated Aeon Lunar.

He gunned down Aeon while praying at a church to confess his sins.

Trivia

 * Xin is a Characther from Grand Theft Auto: Chinatown Wars
 * He does die in the mission "Xin of the father" which is commonly pronounced as "Sin of the father" a reference to killing Aeon Lunar at a Church.