After drawing Sombra soldiers, I though I should draw some characters from Celestia side.
 
Flash Sentry: A former crystal guard who served under the orders of Shining Armor. He and three of his men were found in the icy plains of the crystal empire, trying to escape from Sombra soldiers ; they were saved by the wonderbolts and brough back to Celestia camp. It turned out they did not escape the jails of the crystal empire but were actualy released by Sombra after being tortured and hypnotized to kill Celestia, fortunately Flash figured it out and managed, with Rainbow dash help, to prevent one of his companion to blow up half of the army in his attempt to kill the princess.
 
Although he is not a crystal pony, Flash Sentry joined the crystal guards to serve under captain Shining Armor, a soldier he looked up to. Also, as a guard he was trained in ground combat but use his pegasus speed and agility to deal fast and precise strikes. His weapon of choice is a staff.
 
Secret agent Sweetie Drops/Shadow trooper 80/v007: A former agent from Celestia’s anti-monster agency. When Sombra returned, Princess Celestia called back all the member of the agency in order to infiltrate the Empire ; at some point, Sweetie drops was tasked with the mission of assassinating Sombra to put an end to the war but unfortunately she was defeated by Sombra and turned into a shadow trooper who was then sent in ponyville to kill the mayor who was going to give a speech.
 
Thanks to her training and her new abilities as a shadow trooper she killed all the guard who were protecting the mayor and she would have killed her as well if Lyra didn’t get in the way ; when she told her that “if she touch her, her friend Bon Bon will kick her ass” it brough back some conscientiousness in Sweetie drops and after a long strugle, she managed to break her mind control.
 
Her last action was to ask Lyra to report everything she learned to Celestia and then to kill her, as the state she has been reduced to was worse than death.
 
Secret agent Eurydice: At first, Lyra though the war did not concern her, and was always complaining that Bon Bon had to go on mission, leaving her alone, but after the incident in which Bon Bon lost her life, she saw things differently, she saw the horrors that could happen to anyone and had happened to many already and will continue to happen if Sombra is not defeated, so after transmiting agent Sweetie Drops’ last report to Celestia, she asked her to join her intelligence service.