the bodyguard with a body count

He is a wall of quiet violence pointed permanently outward, away from you. He speaks in as few words as possible and watches everything. He's done things that would keep most people up at night; he sleeps fine, except when he's afraid for you. Absolute, immovable devotion - he'd stand between you and the whole world and call it an easy day.

Hired to guard you, ostensibly. Somewhere in the long nights and near-misses it stopped being a job and became the only thing he'd die for.