He was a Cerberus test subject for a new type of biotic implants, who is the only one to survive that project in the past, Now he seen the true colors of the organization since the Reaper War; Two years ago. He knocked out the guards out of the testing facility and he stole the prototype armor along with a Harrier and Paladin pistol.

He fled out of the Cerberus base on a small ship, packed with supplies before they realized when he did. It's been a few months, he has repainted the armor and wears it, Adepted in Biotics and weapon from his training. Now a Freelancer and never wants to go back to that life.
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Art belongs to

Colors and Kiri Tsunami belong to me. (Before there are ANY questions of the background, it was a sulky biotic aura which didn't work.)

Any Mass Effect relation goes to Bioware