Anti-Hero: Mamoru. People wonder if he was hired to fight the criminals so that, even if he died, there would be one less evildoer in the world.
Mamoru is clearly disgusted by people and acts that most would agree to be clearly evil though. It is less about him being evil as it is him finding it hard to bend over in order to be a saint, as being saints seem to be policy within the Element Networks.
Though his katana CAN cut through anything, So... justified?
Considering that he cut through the carbon fiber armor of Fang's "Beast," slicing through an outdated tank is nothing. However, since he couldn't cut through Tate's titanium alloy arm, the "Beast's" armor was probably of the weaker variety or was very thin, as allotropes of carbon are the "strongest" materials ever produced by man.
Artificial Limbs: Tate's metal arm is his primary weapon/defence. Edge steals an upgraded version of Tate's arm .
Attack Drone: Fang uses special remote drones with sound dampeners so Mamoru's eyes can't detect them.
"If you turn your inept killing intent towards me now, no matter who you are, I'll cut you to pieces. Whether you've got a weapon or not... even if I'd be fighting an old man or a woman or a child... I can't go easy on them, either. Seeing as I can't check with my eyes, that is."
Badass Grandpa: Zelm looks old enough to at least have grandchildren, but he's the one who taught Trump all their techniques. The few times he's fought so far, his killing method is so invisible that it hasn't even been revealed yet.
Bad-Guy Bar: The "Nest of Geese" that Jesus and Wiseman hang out is one of these.
Bank Robbery: They come across one being done by the infamous "Five Minute Gang", named so because it only takes them that long to rob a bank.
Bears Are Bad News: And thus, Mamoru decided to make Haruka fight one as part of her training.
Berserk Button: You do not want to look Mamoru in the eye when he's dealing with the man who got Haruka's parents killed, and ruined her chances of a happy life — or anyone else who caused her (or other innocents) harm, for that matter.
Jesus carries over his Berserk Button from the series he's originally from. Threaten his students and you'll pay for it.
Genda and Aegis both get pissed when a raging Edge Turus declares Haruka, the girl whose life he's helped to ruin, is his property and he will not let anyone take her. They share the same look of rage and charge right at Edge to deliver a brutal Curb Stomp on him.
The Blacksmith: We have not met him yet, but someone is making Mamoru's molecule thin sword. We do see a note from him though.
Blessed with Suck: Haruka; sure she can read the future, but it caused her parents' death and she cannot even go to school without people watching her all the time to ensure that she does not get kidnapped.
Blood Knight: Mamoru. Upon meeting Aegis, who was apparently sent to help Haruka, Mamoru said that he wanted to fight him no matter what since he hasn't met anyone who could fight him head on.
Bodyguard Crush: Not yet, but it is implied that it will happen eventually because...
Wife Husbandry: Inverted? Haruka says that she and Mamoru will be married one day, and she's doing everything she can to make it happen. Mamoru knows nothing about this and Igawa and Sierra were asked to keep quiet about it.
Apparently Mamoru knew about it and agrees to marriage if they survive the current battle.
Broken Bird: Juliet lost her uterus when she was raped some time back, so she can't have babies. This explains why she's usually such a Jerkass to Sierra, who laments quite a bit about her dead daughter.
Chekhov's Gunman: Remember her? One panel of kind-of-flashback in the first chapter? Turns out she's Luna, unmasked, and probably also the last thing Mamoru ever saw with his own eyes, right before she very messily died.Nobodysaw that coming.
Crossover: Tate, Jesus, and Daiba all have their own series. Liu Yijian and Dragon Gate organization also appeared in Tate's series.
Cynicism Catalyst: Sierra and Kilo's daughter was killed before they joined The Wall. Also Igawa's sister and Aegis' family.
Death Seeker: The Canes Venatici. Mamoru noticed that they are quick to kill their own and felt that their super soldiers fought like they wanted to lose. This owes to the fact that they're the unsold products from TPC's operations that were kept and raised to be soldiers, and were addicted to a certain drug to ensure loyalty.
Everyone Calls Him Barkeep: Excluding Alpha Jack Garvey and Sierra Serena, the names of the Wall members are unknown, and they're only ever referred to as their code names.
Also, Jesus's real name is unknown by anyone.
Enemy Civil War: In terms of spying on Haruka and all when she gets in school with Mamoru and meets Jesus. They're the Public Security Intelligence Agency, 24 (A reference to the actual 24?) and the Galboan Black Unit.
Gambit Pileup: Wiseman has his own plans and is putting Mamoru's in to motion, maybe. Haruka has a plan that she is getting The Element Network to put into motion for her. Last but not least, Daiba has his own plans in the work. Just about all of them are revolving around Haruka.
Good Is Not Nice: Mamoru. He may fight crime, but he's openly admitted to only doing as such so he can continue to fight and hone his skills. YMMV slightly though, as he has toned it down a little from the start of the manga.
Also, Jesus, maybe even more so than Mamoru. Sure, he went to Chechnya to search for his missing student, he saved some of the kids from the Canes Venaciti, and he got rid of Orion. This doesn't stop him from warning Haruka that if she or Mamoru get in his way, one or both of them will die by his hand.
Made a little bit more plausible by the fact that his glasses allow him to see where a gun barrel is pointing and just as likely is able to tell when someone is pulling a trigger, therefore all he has to do is make sure his blade is in the way, rather than reacting to the bullet itself.
The Jail Bait Wait: Not that Mamoru is invoking the trope himself but if Haruka's premonition about their marriage holds true, which it likely will, then the start of any real intimate relationship between the two is most likely waiting on this. In a side chapter, it reveals the vision Haruka had of their marriage featured a visibly aged Haruka, who had to be at least in her late teens or early twenties.
Katanas Are Just Better: Mamoru, even before he lost his eyesight. Despite being trained with firearms, his drive has always been for the blade.
Put on a Bus: Sierra and Kilo were injured and put in a hospital to recuperate. A recent chapter has Sierra fully recover and try to find Haruka, and in a much later chapter (after the Time Skip) she goes to train under a swordmaster who helped Mamoru.
Took a Level in Badass: Subverted with Edge. He stole an upgraded version of Aegis' arm and complemented it with Fang's drone controller. He still got pummeled.
Trickster Mentor: Mamoru is accused of this by Haruka with his interactions with Dai.
Waif-Fu: Justified, female The Wall operatives are trained paramilitary, and Haruka can take advantage of the fact that she can read the future. The latter Took a Level in Badassafter being trained by Mamoru to fight BEARS.