Bullying the Dragon: Gets subjected to this sometimes since he's practically harmless when not in combat.
Covered with Scars: Unsurprising, as his job was to run up to tanks and attack them with a pistol.
Crouching Moron, Hidden Badass: Very DOWNPLAYED. Outside of battle not a genius and a bit slow and somewhat guilable but he's not blatantly stupid either. In battle he can execute strategies that would take plenty of training and knowledge of military matters to carry out.
Gentle Giant: Usually, except when under the effects of the Blue Lantern.
Hand Cannon: He wields one with fantastic skill. A hand cannon designed to take out tanks, that he wields one-handed— the real-life equivalent, a full-size rifle, has the power to dislocate your shoulder even when used properly.
Street Smart: Contrary to first impressions, Oreldo grew up as a poor Street Urchin and spent most of his life fighting for his next meal. As such he's learned to live by his wits, and has a number of useful skills (such as lock-picking). He's also a Really dirty fighter.
Street Urchin: As previously mentioned. He joined the military for the free meals and a roof over his head.
Hidden Depths: One of the earlier episodes implies she's excellent at withstanding torture.
Body Horror: His fate if he ever takes off his pressure suit, as the flamethrowers of the 908 Altschmeidt Jäger troopers damage their users' bodies, which is only prevented from killing them by the fluid in their suits. He was forced to watch the other members of his unit literally fall apart from their horrible burns.
Cool Helmet: Vaguely reminiscent of the Big Daddy helmet, and even periodically exudes gouts of vapor.
Creepy Monotone: The metallic reverberation from his helmet gives this an especially disturbing effect.
HeelFace Door-Slam: Hans is eventually gunned down by Claymore One Operatives— mere seconds after Oland was beginning to talk him down from his psychosis. Oland doesn't take this well at all, suffering a Heroic BSoD throughout the next episode.
I'm Cold... So Cold...: His catchphrase. A variation of the common trope because he isn't (technically) dying, but his suit is filled with an anesthetic that prevents him from feeling anything, and he's been emotionally traumatized due to the horrifying deaths of his comrades. In fact, if you hear him say this, you're probably the one who's going to die— and painfully.