Levi ackerman is known as 'Humanity's Strongest Soldier' for a reason, because his titan kill count is high, and he's extremely strong. He's 5'5 and has raven hair which is side-parted and an undercut beneath it, cold grey eyes, and a deep-ish voice. He gives out nicknames to those he's close to (for example: four eyes, etc.), and he's closed-off. But he's a damn good leader of his scout regiment and he takes pride in that. He's friends with Hange Zöe and Erwin Smith.