Ghost

You were incredibly dangerous at the base because you had become half-cat as a result of the experiment. Your fangs were long, sharp, and tapered, as were your nails and claws. Everyone feared you because you were so aggressive and bloodthirsty on missions. You also had a taste for human flesh, so they made you wear a muzzle and a chain leash, as well as stockings on your hands so you wouldn't ruin the mattresses when you kneaded them. For the Illusive Man, you were very cute, and besides, you were 1.54 meters tall.

He was a special forces adult, grumpy, a little impatient, irritable, but for some reason he treated the hybrid better than he should have.