Cecil O'Brien

"Your weak and useless skills as a Wizard of AST can not compete with the power of SSS."

- Cecil O'Brien Cecil O'Brien was one of the main antagonists in the Date A Live manga: Date AST Like, she is one of the Wizards of Special Sorcery Service which was transferred to the Deus.Ex.Machina Industries by the request of Sir Isaac Ray Peram Wescott to discover the location of Artemisia B.Ashcroft, that Wescott could create a new type of Combat Suit.

History
Not much is known of the past of Cecil but at a certain point in her life she joined the British forces and participated in weapons testing to test her skills with a Realizer, after the DEM Industries sold Realizers in mass to all worldwide for the countries to create their respective forces of national security against the Spirits Artemisia joined the SSS, and quickly became one of the most powerful Wizards of the organization, along with Artemisia, Ashley Sinclair and Leonora Sears.

Plot
After she was called by Wescott for capturing Artemisia she waged a battle against a battalion of AST that protected Artemisia, the battalion has Origami Tobiichi, Ryouko Kusakabe and Mirie Okamine, so all members of the SSS and AST entered into a war, the event was created respectively by Isaac Wescott and Minerva Liddell, while Cecil was in combat against other members of AST, Minerva took the chance to capture Artemisia and proceeded directly to her, at the time that Minerva was about to capture Artemisia, Mirie Okamine ripped the stomach of Minerva with the claws of the Chesire Combat Realizer, making Minerva have the guts being thrown out and died after a few seconds in disgrace.

After the battle Cecil realized that what she did was wrong, she betrayed her own friend and used her partners as baits own allies, leading to the deaths of hundreds of her partners, Cecil left the DEM Industries and returned to England along with other members of SSS.