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Main Characters

In General

Cool Big Bro: Both Gero and Kinosaki are loving older brothers willing to put everything on the line for their younger siblings. Gero changes his life plan of ending the Poison Clan with him the moment his sister (a lesbian with a girlfriend) is threatened with forced impregnation otherwise, while Kinosaki only turned into a marriage swindler to gather money for his younger brother's medical expenses.
Hair-Contrast Duo: Dark blue-haired Gero is awkward and a powerful fighter; clear-haired Kinosaki (who wears wigs, and in colored pages is sometimes pink, sometimes blond) is a social expert with people skills but no fighting prowess.
Sensitive Guy and Manly Man: Downplayed. Kinosaki is a delicate crossdresser and seducer, while Gero is a skilled martial artist and doctor. That said, their relationship is more complex, and while Gero is not as feminine as Kinosaki, he is still inexperienced and awkward with women compared to him, whereas Kinosaki is known to be much more fluent and forward at intimate affairs like dating.

Hikaru Gero

https://static.tvtropes.org/pmwiki/pub/images/mtxn_gero.png

Heir of the Poison Clan

"I want to have someone too! I want to live a normal, happy life with someone I love! I want to be asked 'How was your day' before dinner! I want to have casual chats before bed! I want to be asked if I'm okay when I cough! I want to care and be cared for!"

An awkward and amiable assassin who only kills those he considers trash to keep his conscience clean. In a bid to protect his sister from the clan's matriarch, Gero allies himself with Kinosaki to find himself a proper wife after having completely given up on romance.

Acceptable Breaks from Reality: Gero uses a gas mask that leaves his right eye exposed. For obvious reasons, this would be completely useless in real life.
Big Brother Instinct: Gero is protective of his younger sister. His whole reason for wanting to find a wife despite his initial wish to end the Poison Clan with him is because the clan's matriarch would otherwise force her to leave her girlfriend and produce a heir.
Cast from Hit Points: All of Gero's powerup toxins are still poison despite his acquired resistance, and if he uses them too much or for too long he'll start dying.
Cathartic Chores: He doesn't feel at home unless his place is neat and tidy, all cleaned up, and if he's had a bad day he spends the nights afterwards cleaning public toilets and the like. As a result, he's become an urban legend called the Midnight Cleaner.
Chemistry Can Do Anything: From slicing a van in half to creating a hallucinatory gas to absorbing water, Gero can pull off a crazy number of tricks.
Good Feels Good: What becomes Gero's M.O after he partners up with Kinosaki, moving away from his traditional assassin work into being more of a hero-for-hire on the latter's advice, on the logic that it will help attract women. As it turns out, this approach helps Gero realise that the world is filled with many more kinds of people than the scumbags he's used to dealing with, resulting in a much more fulfilling career path.
Green Thumb: One of his chemicals, "Jacked and the Beanstalk", causes plants to instantly grow enormous.
He Cleans Up Nicely: After Gero starts his quest to find a wife, he consistently wears a black dress jacket, slacks, loafers, and a white button-down shirt. The collar of the shirt is patterned in a liquid theme and colour spreads show that it changes colours regularly, implying he has more than one. The pattern is so distinctive that it's used for other things associated with Gero as well. Also Subverted as well, since it's made clear that looking good is only the first step to attracting a partner, and offputting behaviour like the inexperienced Gero's can sour a first impression really quickly.
I Just Want to Be Normal: He admits in the first chapter to dreaming of having a normal life and a normal relationship, wanting things like someone that will ask him how his day was and just be cared for.
Master Poisoner: He's a specialist in the use of poisons to kill his targets, as well as making a variety of effects, like acids and hallucinogens.
Mundane Utility: Gero uses a chemical so strong it can instantly cut through steel to clean bathrooms.
No Social Skills: Gero was raised to be an assassin, and because of that, he didn't do things like go to school or any other socializing and is therefore very awkward around people. Trying to go to a match-making session after hearing that income is one of the most attractive parts of a man just makes him blurt out his income randomly to people, which makes him come across as boastful. His smiles creep people out and his refusal to eat in restaurants (because he was trained to not eat food served by other people) makes his date leave.
Oblivious to Love: An entirely justified case, as Gero's very socially inept in general. One example that stands out, though, is when Gero needs Kinosaki to spell out that Arashiyama has feelings for him when it couldn't be more apparent.
Pragmatic Evil: Downplayed. At the end of the day, Gero recognizes that his focus on killing only people he considers human garbage is more of a way to keep his conscience as clean as possible rather than a genuine desire to eradicate evil from the world.
Sacrificed Basic Skill for Awesome Training: Gero's lack of social skills is a side effect of being trained as a lone wolf assassin for his entire life. The poor guy never even went to school, causing him to become very enthusiastic during his cover as a university student on a job.
Socially Awkward Hero: Gero is practically the spitting image of this trope. He has no issue with fighting other assassins on a regular basis, but finding a spouse is by far the single most daunting task he's ever taken on in his entire life.
Super-Senses: Gero has several toxins which enhance his senses.
- Toxin: Lunar Pike enables Gero to dodge multiple incoming attacks by enhancing his tactility and reinforcing his body strength, predicting where strikes will come from and adapting accordingly.
- Toxin: Vision enhances his eyesight, although it can be outpaced by opponents like Piichi.
- Toxin: Hyper-Hearing enhances his auditory sensitivity.
Super-Speed: Toxin: Hype gives Gero this power, and can even let him walk on water.
Super-Strength: Toxin: Pike Fist gives him this ability, particularly when it comes to striking attacks.
Supreme Chef: Gero was instilled with the lesson to never eat anything he doesn't cook himself due to the risk that someone may try to kill him by poisoning his meals (which he himself has done). As a result, he grew up only eating his own cooking, and has such advanced culinary skills that a group of university students are overwhelmed by how he manages to turn low-grade, store-bought ingredients into the most delicious kebabs they've ever tasted.
Trademark Favorite Food: While never referred by name, Gero frequently partakes of Nerunerunerune, a kind of candy where several packaged components are mixed by the user to generate a candy paste. This might be due to his aversion to any food that he's not involved in its making (see Supreme Chef above).
The Wise Prince: Gero is the heir of one of the Top Five Families, but is deeply saddened by what is implied to have been a horrifically traumatic training process imposed on him and an overall lonely life, resigning himself to never finding someone so he can end the cruelty of his clan. Chapter 23 also shows that people in his position have immense power over the other sub-families, like the Bug User and Needle User families (up to being able to execute them on a whim), but he never abuses it and actually befriends those under him.

Mei Kinosaki

https://static.tvtropes.org/pmwiki/pub/images/mtxn_kinosaki.png

Marriage Swindler

"Of course, being an assassin is a huge red flag, but honestly, I think you just need to go around and meet more people. You'll be fine. There are all kinds of people out there. If you bare your soul and show your true colors like you just did with me, you'll eventually find someone who's interested in you."

A professional marriage swindler. Kinosaki is a beautiful man who sometimes cross-dresses and gets both men and women with his schemes. He is rescued by Gero after he was originally targeted by him, in exchange for helping him find a wife.

Ambiguously Bi: Kinosaki unhesitatingly charms both men and women (as a man or woman) to serve ends meet, but it's not clear which, if either, he is actually attracted to.
Attractive Bent-Gender: Kinosaki makes a very cute girl, mostly because he's very androgynously handsome as a guy.
Big Brother Instinct: Every scam Kinosaki's ever done has been for the benefit of his little brother Okuto, who without continuous funding for treatment will most likely die of a currently undisclosed medical condition. After partnering with Gero, he's able to provide even more funding than usual, with Okuto being well enough to send his brother dumb selfies on a daily basis.
Big Eater: Kinosaki can scarf down so much food in a single sitting that Gero bluntly calls him a pig. According to his profile in Volume 1, he spent a long time destitute, and thanks to that he'll eat anything.
Chick Magnet: In one of the bonus chapters, Gero tries to imagine what Kinosaki would look like if he's not cross-dressing. In the Imagine Spot, all the girls flock to him like moths to flame, leaving Gero in the dust.
Crossdresser: Yup.
Cuteness Proximity: Kinosaki outright gushes over Sirius, Arashiyama's hamster comapanion.
Defiant to the End: Kinosaki attempts to seduce Gero into loving him after being poisoned. He admits to doing it only because he wanted to go down fighting, even if he knew it was pointless. That said, he apologizes for his stunt when realizing that Gero is a nice person struggling with loneliness deep down. That makes Gero realize that Kinosaki doesn't fit into his pre-requisite of being human garbage.
Depraved Bisexual: Subverted. Kinosaki is a crossdressing, Ambiguously Bi marriage swindler that uses his charms to gather money from his targets. That said, he is doing that out of a need to help his sick brother on expensive medical treatment, and while he continues to use his charms on both men and women, it comes with the intention of helping Gero.
Distressed Dude: Kinosaki is saved by Gero during one of the latter's jobs, and the two quickly become friends.
Even the Guys Want Him / Even the Girls Want Her: Kinosaki is able to charm both men and women with ease. During Gero's date with Himekawa, Kinosaki has both a waiter and a waitress swooning over him.
The Fashionista: Fashion is one of the most versatile tools in Kinosaki's arsenal of scam tactics, and the manga shows it off. Whether it's a practice date, an undercover job, or a wedding, he's consistently in clothing that makes him look cute, sexy, or cool.
First Law of Gender Bending: Kinosaki identifies as male, and is nominally fine presenting as such, but we almost always see him dressed as a girl. This is handwaved in a special chapter that shows Kinosaki is such an attractive guy, he'd overshadow Gero with the women.
Guile Hero: In sharp contrast to Gero, Kinosaki may not be able to hold his own in a fight very well, but he's excellent at using his wits and charm to turn a situation in his favor.
Hair of Gold, Heart of Gold: He's a blond, and he's a way nicer person than you'd expect a marriage swindler to be.
Hidden Depths: He has many skills meant to attract older rich men, which include things like being a sake sommelier and driving boats.
Hooker with a Heart of Gold: Somewhat; Kinosaki is not a sex worker, but his job is to seduce people into losing money to him. That said, he is shown to be nothing but kind to everyone but his targets. Even when he was on the verge of death at the hands of Gero, he still gives Gero solid dating advice and assures him he will meet someone proper for him if he just keeps opening himself up and meeting new people.
Iconic Item: A black scarf patterned with flowers in multiple colours. Kinosaki incorporates it into every outfit he wears and it becomes particularly distinctive in colour pages.
The Not-Love Interest: In any other manga, Kinosaki would be a likely subject to a First Girl Wins scenario where Gero would realize the person he was in love was right there all along. Kinosaki being male, however, throws a wrench in that scenario; even beyond Incompatible Orientation, Gero specifically needs a lover he can conceive an heir with.
Positive Friend Influence: After the Ureshino arc, Gero notes that Kinosaki pushing him to get out of his shell and meet more people has made him develop a more positive view on the world.
Romantic Wingman: Invoked. Since Kinosaki is a marriage swindler, he's a lot more experienced in the field of romance than Gero could ever be, so Gero enlists his help to find a suitable bride.
Science Hero's Babe Assistant: Subverted. Gero and Kinosaki cerainly fit the type, with the former's abilities derived entirely from his medical skill, with him even having enough knowledge to prescribe medicines to others, while the latter is a fashion-focused seducer whose primary asset is his beauty and sexuality. However, the power dynamic of their partnership is much more complex, with Kinosaki serving as an advisor and mentor to Gero in romantic affairs and Gero's overall attitude meaning they're much closer to friends than simply client and hire. And of course, Kinosaki being male blows this trope up from the outset.
Stating the Simple Solution: As someone infinitely more grounded than Gero, Kinosaki's advice tends to lean on the practical and simple. For example, the first thing he teaches Gero is that dating is a numbers game and that he should start his wife search by just meeting new people, which prompts him to put Gero on speed dating and dating apps.
Supporting Protagonist: When it comes to the parts of their relationship that deal with underworld politics and threats, Kinosaki takes a backseat to Gero's direction, working to support him against his opponents in whatever way he can, usually by making sure their client is safe during the chaos.
The Tease: He's pretty easy on the eyes, and he knows it. In the second chapter, for instance, he teasingly suggests for Gero to join him in the bath in order to prove that he's a male.
The Watson: Comparing Kinosaki and Gero is like comparing a freshwater fish to a deep sea predator in terms of their place in the underworld. He's not as knowledgeable about the deeper aspects as Gero is, having no idea about the Top Five Families and the power politics surrounding them until Toshiki explains them to him. This serves to clue the audience in on what information will be relevant in the future.
Wholesome Crossdresser: Downplayed. Kinosaki is a marriage swindler who cross dresses to make it easier to swindle men, but on a personal level, he seems to be a pretty amiable guy who grows fond of Gero and is willing to help him. He keeps crossdressing partly because he thinks he looks cute in women's clothing and partly because he would be so charming as a man, it'd be hard for women to notice Gero, something the latter agrees would be the case.

Gero's Clients

In General

Damsel out of Distress: Downplayed. In sheer fighting power, they're outmatched by Gero, and depend on him to defeat whoever the specialist Arc Villain is, but they also refuse to be pure damsels needing to be saved.
- Himekawa jumps into the middle of the fight between Gero and Ushio and straight up claims she does not want to be a damsel that Gero gets to save and insists on helping him wherever she can.
- Ureshino is pretty damseled with her shy demeanor and no fighting skills, but her magic tricks and knowledge of her company products allow her to put up a fight against Naruko's trump card, the massive golem Grand Actor, by mixing a magic trick of hers to cause a massive explosion, and in the process breaking the hypnosis her classmates were under.
- While kidnapped, Arashiyama gathers the other Beast Users in the jail cells, teaming them up together and breaking out of prison. She's able to lead an organized defense against Toshiro, since he consumed all the specialists' animals, and the same specialists, when combined, can ask their partners to stop. Toshiro's last ditch effort to kill Kinosaki is stopped in the middle, letting Gero finish him off.
- Akakura actively requests that she be the one to rescue Erina, with Gero providing support for her.
Girl of the Week: Each of them have an arc focused on them and their relationship with Gero.

Kyoko Himekawa

https://static.tvtropes.org/pmwiki/pub/images/mtxn_kyoko.png

An expert art thief who rescues paintings and artworks from rich men that swindled them away from the families that rightfully owned them. A group of her friends hires Gero to rescue her once she is kidnapped.

Animal Motifs: Kyoko loves sharks, to the point of having her own named Jawshua, her "shark-ner in crime." When she arranges to meet up with Gero and Kinosaki after they rescue her, she chooses a restaurant/disco with a shark theme, where everyone has to wear a shark-shaped hat for some reason. Also, when chatting with Gero in the bonus chapters, she never fails to use her many shark stickers complete with sea-based puns.
Bound and Gagged: When she's kidnapped by the Captain, she's tied up to a chair and has duct tape placed over her mouth.
The Empath: Kyoko has an almost supernaturally big heart, being able to not only develop an emotional connection with a shark that serves as her sidekick, but also register the emotions held inside artworks and where they should be in the world.
Just Friends: During her date with Gero, the two of them decide to stay as friends for the time being. After all, you should get to know someone before you decide to start dating them.
Just Like Robin Hood: Kyoko Himekawa is an art thief that is known for stealing art taken by predatory collectors and returning it to the rightful owners.
Ms. Fanservice: A number of shots emphasize her breasts and butt. One of the bonus chapters also draws her in a bikini.
Orphan's Ordeal: When her and Gero have a one-to-one after she's rescued, they bond over their shared dysfunctional upbringings. Kyoko was an orphan adopted by the incredibly wealthy Mr. Himekawa, who she wagers simply wanted to leave a legacy behind rather than him having any explicit concern for her as a person. After he died, she inherited his estate and discovered the massive art collection he'd accrued over the years, and was horrified at the state of the works that were kept locked away from the world. She spent almost all of her inheritance returning the works in her adoptive father's collection to their rightful owners, thus starting her on the path she's on now.
Pungeon Master: Yep.
"He's my shark-ner in crime, Jawshua!"
Stealing from Thieves: She's an accomplished art thief, but she only steals back art with the intention of returning it to its original owner.
Tears of Joy: Sheds these after Gero tells her just how incredible of a person she is. Apparently, no one's ever bothered to praise her so openly.
Tomboy with a Girly Streak: Himekawa's an outdoorsy young woman who moonlights as an art thief. That said, she also dresses in an openly feminine manner during her date with Gero.

Shiori Ureshino

https://static.tvtropes.org/pmwiki/pub/images/mtxn_shiori.png

The daughter of a recently deceased company owner. She is shy and just entering college, and her uncle hires Gero for protection when her aunt is targetting her to get her part of the company.

Birds of a Feather: She has the most similar personality to Gero of the romance candidates so far; they're both shy and awkward, with a passion for magic tricks.
Black Magician Girl: She takes on this persona with Kinosaki's style expertise to sell the illusion of her exorcising "Chladni" (really Naruko's Grand Actor) and free her fellow students from his brainwashing. To do this, she uses her company's highly advanced party goods to play at summoning a fire demon she dubs "Inferniel" and launch it at the golem. The explosion's pretty big.
Character Development: Shiori's arc focuses on her development. When introduced, she's shy, withdrawn, and anxious despite her desire to reach out to others and inherit the family company. Over the course of the story, Gero and Kinosaki encourage her to come out of her shell, ending with her stepping up to save her classmates from committing a murder while under a hypnotic frenzy as well as asking her evil aunt to teach her to become a businesswoman that can take on the family enterprise.
Grew a Spine: She becomes way more confident following the incident in the woods.
Heroic Willpower: Breaks out of Naruko's hallucinations through sheer force of will. While he had a backup plan to trick her into walking off a cliff, this actually puts a snag in his plans and enables Gero to easily rescue her. Furthermore, it's this willpower that motivates her to save her classmates from their hypnosis, preventing them from killing someone in their mass delusion.
Nervous Wreck: Played for Drama. Shiori's social anxiety causes her to completely freeze up in social situations, as her brain spins through a variety of topics both relevant and trivial as she panics about a way to properly interact. It's her incapacity that motivates her aunt to have her killed.
Shrinking Violet: She is extremely shy and worried about other's opinion of her, which causes her to have a hard time connecting with others and making friends.
Stage Magician: As expected of the heir to a party goods company, Shiori is an expert at magic tricks, which helps her snap her brainwashed classmates out of Naruko's mind control.
Weak-Willed: Averted. She manages to shake off Naruko's mind control; it's one of many reminders that she's far tougher than she makes herself out to be.

Kimie Arashiyama

https://static.tvtropes.org/pmwiki/pub/images/mtxn_arashiyama.png

Hamster User

A boisterous woman that hides a very insecure side, she is from a very small and now disrespected family of the Beast Clan. She is a big fan of Gero and hires him to protect her when an assassin starts taking down specialists.

The Baroness: Parodied. Her attempts to portray herself as a confident and imperious beauty instead just come off as arrogant and awkward, making her even more of an outcast than she already is.
Boisterous Weakling: Although she is proud and acts high-and-mighty, she is pretty aware she has no fighting skill and quickly loses her boisterousness. Deep down, she is insecure about her skills and wants to get stronger.
Damsel in Distress: Becomes this after her loyalty to Gero, her rescuer, supersedes her loyalty to her clan. The collar around her neck, which represents her position as a sub-branch member, is activated and revealed to be a serpentine organism which will drain her of blood in three days. After that, the main characters decide to complete their job to protect her by going after the main Dogo Family of the Beast Users to find a way to save her. She feels horribly guilty about it and tries to get them to give up but fails.
The Ditz: Pretty much her defining personality trait. Kimie repeatedly acts before thinking, which ironically saves her from meeting the same fate as the other sub-branch members of her 'pack' because she went to get Gero's protection before talking it over with them.
Explosive Leash: Like most of the other branch family members, Kimie wears a choker around her neck that's actually a lizard that injects her with slow-acting poison should she defy the main family.
Fangirl: Of Gero, mainly due to admiring him as a Top Five Families member while she's a measly sub-branch leftover. Him not only being nice to her but also accepting her request for protection with very little argument blows her freaking mind.
Faux Action Girl: Initially Played for Laughs and then later for drama. Despite being a specialist, Arashiyama is completely incapable of holding her own in a fight. Hamsters aren't exactly the most fearsome creatures out there, after all. It's the main reason why the Beast Clan considers her disposable. That said her powers do allow her to organize a prison riot.
Forgotten First Meeting: It's revealed that she and Gero actually met each other as kids when he saved her during one of his jobs, though only Arashiyama remembers it.
Genki Girl: Kimie expresses all of her emotions very openly and intensely, from joy to sadness to infatuation.
Heart Is an Awesome Power: It's clear that her skill gives her little capacity to fight against the overpowered assassins of the setting, which fuels her belief her powers are useless. That said, her powers are pretty useful as a support and survival skill. The hamsters she command have nigh-human levels of intelligence; are small, fast, and nimble; and completely loyal and devoted to her, which gives them plenty of usage. A chapter showcases that she is capable of getting them to collect food when lost in the woods, to make a map for her of the island, as well as indicate the path to their destination, and can be used to get her out of a cell.
Impoverished Patrician: Her family might as well be the underworld equivalent of this. Formerly known as the Mouse Users, they were respected even by the main family, but over the years their power waned until hamsters were all they had access to. Kimie herself is consistently disrespected by the other clan members, arriving at meetings on time only to find that everyone's already wrapped up the important topics, with only her ancestry tying her to them. It's to the point that if they randomly decided to banish her tomorrow she wouldn't be all that surprised about it. When she breaks out of the Dogo family's prison, it's revealed that she can control mice again by having her hamsters speak to them.
Love Confession: While both Himekawa and Ureshino are heavily implied to be infatuated with Gero after he saves them, Arashiyama outright says it.
Ms. Fanservice: Arashiyama has the most buxom figure out of all of Gero's romantic prospects and wears an outfit that shows off the most skin, both of which are emphasized with how she's typically drawn.
Proud Beauty: Parodied. While Arashiyama certainly looks nice, she has the habit of boisterously hyping up her own appearance, which just has the effect of turning people away.
Secret Art: Parodied with Altered Lineage Amplified: Canis Major. After the build-up of other specialists' Amplified skills, it's initially presented as something that will help her fight on equal terms with her opponent . . . only for it to be a glorified magic trick that cues her hamsters to form the constellation of Canis Major with their bodies. Why she thought it would help is anyone's guess.
What Kind of Lame Power Is Heart, Anyway?: Other members of the Beast User clan can control animals like giant squids, hippos, and eagles. Kimie gets hamsters.

Chinatsu Akakura

https://static.tvtropes.org/pmwiki/pub/images/mgtxn_chinatsu.png

Protector

A Protector (aka an underworld bodyguard) with a lively personality. She hires Gero to help her protect a young girl named Erina.

Action Girl: Out of all of Gero's romantic prospects, Akakura's the only one who is a competent fighter in her own right. Furthermore, while his other clients were targets who he was hired to rescue and/or protect, in Akakura's case she seeks his help for the sake of protecting Erina.
Badass in a Nice Suit: She has strengths that put her in similar footing to Gero when it comes to fighting mooks, but does all of it while wearing a pantsuit.
Battle Strip: She will take off her shirt once it's too damaged to showcase she has layers of her steel-reinforced tape being worn underneath it.
Improbable Weapon User: Her weapon of choice is steel-reinforced police tape.
Parental Substitute: To Erina, acting as kind of a mom to her.
Sarashi: She wears layers of her tape as this under her shirt, which is essentially a very mobile armor and gives her a great level of protection.

Makoto Himi

https://static.tvtropes.org/pmwiki/pub/images/mtxn_himi.png

A childhood friend of Shiori's, who hires Gero as her rental boyfriend to help her crush her father's ambition to force her into an arranged marriage.

Affectionate Nickname: Shiori calls her Himin-chu.
Beneath the Mask: Defied. None of Makoto's aspects are masks; they're all part of who she is, and which of them she displays is based on the situation.
Big Sister Instinct: She's on bad terms with Gero from the get-go because she thinks he's taking advantage of Shiori and cheating on her.
Childhood Friends: She and Shiori have been friends since grade school, and she's very protective of her.
Commonality Connection:
- Invoked with Shiori; Makoto shows her more timid side around her because she knows Shiori's not good with overly assertive types, and thinks she'll be more comfortable with her timid side instead. Shiori, however, knows she can be more difficult than that, and accepts her nonetheless.
- Gero immediately accepts Makoto's request to become her rental boyfriend, even before she tries entrapping him by recording his voice, because he could never accept a forcibly arranged marriage either.
Distinctive Appearances: She has three thin pale streaks in her bangs.
Fake Relationship: Hires Gero to be her rental boyfriend.
Has a Type: She has a particular image in mind for her fake boyfriend, an upstart businessman with a spunky punk vibe brought up in a poor household, a domineering type who comes off as a Jerk with a Heart of Gold. Seeing Gero adopting the image triggers a Crush Blush.
I Just Want to Be Free: Wants to live freely and do what she likes.
Jerk with a Heart of Gold: While she's prickly and aggressive, her kinder side shows around Shiori.
Shrinking Violet: This side of her shows up around Shiori, her father, and when she's taken aback.
Tsundere: She's this towards Gero by the end of her arc; on the one hand, she still thinks he's a creepy bastard, but on the other, she's taken an interest in him and gets him to add her to his friends list.

Antagonists

Specialists

Unaffiliated

Ushio

Ushio without the suit

The Water User Assassin.

She was hired to torture and get information out of Himekawa about the paintings she stores. She also does plumbing on the side.

Bubble Boy: A very dark gender-swapped variant of this. Ushio possesses airborne contact dermatitis, and the diving suit she wears doubles as a way to keep her skin in check as well as a tool for killing. After getting defeated by Gero, he prescribes her some medication as a power play.
The Bus Came Back: Returns in chapter 34 to save an overwhelmed Gero from a massive attack from the Beast Clan.
The Cynic: A major undercurrent to her and Gero's fight is that Gero is trying to find a way to preserve a modicum of normalcy and humanity in his life as an assassin while Ushio has completely embraced the underworld mentality of discarding anything that might interfere with her work, such as love and family.
Making a Splash: Water User Ushio is capable of manipulating water freely, doing things like waterboarding someone by making water stick to their face or even just making words with it. It's shown that her diving suit is actually filled with water, and since she can influence any of it that touches her skin, it gives her a wide variety of options, such as inflating her suit arm to gigantic size, and when activating Altered Lineage Amplified: Hell's Lashes, summoning a nest of tentacles that can easily destroy her environment.
Punch-Clock Villain: Only fights Gero because the Captain is paying her generously. She offers Gero triple what he was getting paid to switch sides before their fight begins in earnest.
Tsundere: She'd never admit it, but Ushio is implied to have developed some romantic feelings for Gero when the two of them team up to save Arashiyama.
Visual Development: When she returns, she no longer wears her astronaut-like suit, now wearing something a skin-tight full body suit. Doubles as a Fanservice Pack due to showing her quite nice figure.

Naruko

Sound User

The Sound User Assassin.

A charming young man hired by Shiori's aunt to kill her and make it look like an accident.

Awesome, but Impractical: Naruko is capable of feats of absurd power, but he has to be perfectly healthy to use them, meaning that actually getting into combat as opposed to performing an assassination is extremely risky to him.
Because You Were Nice to Me: Gero, after defeating him, gives him some genuine advice, telling him to open himself up to others. Later on, when Gero is possessed by one of Sakazuki's ghosts, Naruko returns the favor by getting Gero to relax, allowing him to exorcise the spirit.
Chick Magnet: Naruko is a Long-Haired Pretty Boy, and manages to attract most of the girls at the welcome party Shiori attended.
Combat Pragmatist: Naruko is not well suited for hand-to-hand combat; his skills usually involve brainwashing people or casting illusions, and this means he is always looking for ways to flee and gather more stamina when cornered, rather than straight-up fighting. For example, he feints an attack by making a violin appear before just hitting Gero with it instead to distract him.
Golem: Altered Lineage Amplified: Grand Actor creates a gigantic humanoid thing by compressing detritus from the environment and binding it together sonically, which can easily crush someone with its fists.
Instrument of Murder:
- Implied to be another specialty of Naruko's clan. During his and Gero's fight, he quickly cobbles together a perfectly constructed violin out of the nearby wood and his own hair. However, instead of using it for another technique, he simply throws it at Gero to misdirect him as he makes a getaway.
- In an earlier appearance, he carries what seems to be a full-size grand piano on his back while monitoring Gero and Shiori.
Kill the Ones You Love: The Sound User Clan is implied to only raise one child at a time. Naruko and his older brother were forced to fight as kids, ending with Naruko killing his own brother, something he is deeply regretful of.
Long-Haired Pretty Boy: He's a long haired blond man and quite popular among women for his looks and relaxed attitude.
Mid-Battle Tea Break: Justified. Naruko's abilities require him to be in peak physical condition, which means that he has to take breaks mid-combat to do things like sit in a massage chair and take a bath.
Mind Control: The techniques of Naruko's clan are geared around this. He hypnotises his own client into massaging him with her being completely unaware of her actions, and later hypnotises the rest of Shiori's class into feverishly attempting to sacrifice her to appease "Chladni", a god he invented and propagated in their minds. He can also use how certain sounds affect the brain to induce auditory and visual hallucinations, and against someone like Shiori with multiple emotional issues, it's incredibly effective.
Mind Rape: One of Naruko's most effective tactics, tricking a target into what looks like a suicide to an outside observer.
Mr. Fanservice: How else can you describe a man with washboard abs who fights half-naked? In-Universe too, as many of the girls in Shiori's class gravitate towards him, much to the guys' jealousy.
Only One Name: He refers to himself as "Naruko" only, and does not give another name.
Punch-Clock Villain: He's honestly a pretty agreeable guy when it comes to matters unrelated to assassinations. Justified since, like the vast majority of assassins, he was born into the job rather than seeking it of his own volition.
Razor Wind: Altered Lineage Amplified: Mind Whisper serves as a variant of this but with soundwaves. It takes the form of various voices which reflect the listener's fears and anxieties, and unless you have a counter-technique which can help you avoid them, they'll tear straight through their target.
Stage Name: He's a member of the band Bourgeoizie (Zokumotu in the original Japanese) under the name Nal-K, where his role is big instruments.
Technician Versus Performer: As Gero says, Naruko's skillset is filled with incredibly complex techniques that require lots of set-up to pull off correctly, but make up for it with their power. However, if his opponent can exhaust or counter enough of his pre-prepared techniques, he becomes open to someone with more adaptability in combat. It's by sticking to his plans that he's baited into a trap that gives Gero the chance to finish him off.
Verbal Tic: Frequently uses "hella" to describe things.
Vibroweapon: Naruko can turn his own arm into one of these with just a whistle, powerful enough to cut straight through a tree.
Walking Shirtless Scene: During his fight with Gero, he only wears compression pants. Considering how acrobatically he moves, it's likely to prioritize mobility.

Doll User

A female(?) specialist who is known to provide artificial enhancements to others.

Face Framed in Shadow: Only shown physically in their operating theatre, where the lighting obscures most of their body except for their neck and head, which appears to be a morass of cables and a mask-like shell respectively.
Greater-Scope Villain: To Bug User's wedding, having provided the enhacements to Yamada which makes him a threat. They're even shown to be aware and approving of his actions, releasing his limiter remotely so that he can cut loose even though doing so will destroy his body.

Sakazuki

Sakazuki-Sensei

Ghost User

The ghost user specialist, a mysterious and gloomy man with powers connected to possessing people and objects.

Artifact of Doom: His skill allows him to create objects that carry the souls of killers. Anyone who wields them will turn into a killer under his command as well. Alternatively, he can create itens with victims of crimes or suicide victims
Otaku: He's introduced playing Dark Souls on his Nintendo Switch and uses video game-inspired names for all of his attacks.
Self-Disposing Villain: Subverted. After being defeated, he admits his loss and goes to cut his own head off using shears. Gero stops him since he doesn't feel the need for it, refuting the rules of the underworld.
Soul Power: His power revolves around manipulating ghosts, allowing him to do things such as brainwashing third parties, increasing his own combat prowess, or debuffing his opponents.
Theme Naming: All his attacks are named after video-game terms, including "DLC", "Debuff", and "PVP".

Beast Clan

Bird User

A specialist stationed at the Dogo Animal Kingdom who is fought by Gero. He's trying to collect the massive bounty on Gero's head so he can go to the United States to popularize his baseball variant, "Birdball".

Alas, Poor Villain: Gero is saddened to see his brutal death at the hands of a boss that doesn't care about him, and his last moments are him dreaming about the fact he could never make the game he invented popular.
Batter Up!: He not only uses a baseball bat in combat, but dresses like a baseball player and uses baseball terms to refer to the fight.
Beak Attack: His birds fight by pecking their prey. Once Toshiro awakens the Crimson Marriage between his blood and Spear User's, he arranges several birds into a spear that uses his eagle's beak as the tip.
Fictional Sport: He loves "Birdball", apparently a baseball variant where the players and ball are all carried in midair by birds. In this case, it's sort of fictional in-universe as well since he invented it.
You Have Outlived Your Usefulness: Killed by Toshiro once he loses to Gero and his birds have been sucessfully used to take his blood. Toshiro dismisses that as him being just a test subject to him.

Byakko

A specialist that serves as Toshiro's maid.

She is a specialist from a shunned family of the Beast Clan, due to their practice of killing and skinning the animals they select, and using said skin as an outfit to use their abilities.

Evil Counterpart: To Kinosaki, as the right hand woman of Toshiro, who himself is Gero's Evil Counterpart too.
Ninja Maid: She is dressed as a maid at all times to serve Toshiro, except when fighting, where she strips to use the skin of a bear.
Number Two: Toshiro's right hand woman.
One-Winged Angel: The massive mutant monster that Toshiro creates is actually meant to be the ultimate animal she can utilize. When cornered by Piichi, Toshiro puts Byakko on it and lets her run rampant.

Toshiro

Toshiro Dogo

https://static.tvtropes.org/pmwiki/pub/images/mtxn_dogo.png

Head of the Beast Clan

The Head of the Beast Clan.

A crazed man with something nefarious in the planning, which attracts the ire of Piichi.

All Your Powers Combined: His real skill is the power to absorb and transform into animals and even mix them up.
Animal Eye Spy: He's stationed animals around the island whose eyes connect to a big cluster of orbs at his headquarters that he uses as a surveillance station.
Animal Motif: Bats. He has an obsession with blood due to using it as a core of his experiments, he uses bats with special chokers as his communicators and has a bat fidget toy in his hand at all times.
Animalistic Abomination: He essentially is one. He has the power to absorb and use any animal parts, and after absorbing Hyakko, which already is an unholy mix of 93 different animal species, he is able to turn his arm into a gigantic animal monster mixing several different beings that needs to be seen to be believed. He's even shown to be capable of growing animal legs from out of his mouth.
Arc Villain: Of the Arashiyama Arc, as he is the true target of Piichi's quest and is the one to poison the titular character.
Bad Boss: As the head of the Beast Clan, he makes everyone under him wear a certain choker as a sign of subservience. Later, it's revealed to be a reptile that will bite and poison the people it's connected to when given the order. He is also prone to disposing of his underlings when they don't serve a purpose to him anymore.
Four Eyes, Zero Soul: He wears a pair of darkened round glasses and is by far one of the most psychotic characters introduced in the manga.
Evil Counterpart: To Gero.
- They're both in the same positions as the heir of their respective clans, but Gero doesn't like the life he has to lead as an assassin, while Toshiro is a mad scientist that enjoys the bloodshed.
- Gero is mindful of others, even those beneath him in the hierarchy (exemplified by his friendship with the Bug User and the Needle User); Toshiro couldn't care less about his own underlings, and happily disposes of them after they fail to meet expectations or conclude their task as his guinea pig.
- Gero has a melancholic disposition, but is a generally kind person. Toshiro seems friendly and upbeat, but he is actually a smug monster.
- In relation to Kimie, Toshiro thinks very little of her, and advises Gero against marrying her so her blood won't spoil his. Gero also thinks little of her when she talks with him initially, but he is respectful of her, and decides to try to see her as a specialist as well, realizing her desire to grow stronger.
Mad Scientist: Piichi is after him from hearing he is up to a mysterious plan that can harm the world. It's implied at the end of chapter 30 that the plan involves mixing the genes of his underlings, shown by the Bird User having powers of the Spear User, as well as having a massive, mutant being in a vat in his room.
Nightmare Face: He makes one when Kinosaki tries to flee from him.

Tonako

Tonako Dogo

New Head of the Beast Clan

The new head of the Beast Clan. She took the position from Toshiro, appointed as the new head of the clan after the events on the island and taking Toshiro and Byakko into custody. She is a mysterious woman whose goals seem to involve uniting the five top families.

Hidden Agenda Villain: She is up to something, for sure, and it involves uniting the clans, possibly by marrying herself to heirs of other clans, but what is in it for her is anyone's guess.
Lady of War: A skilled assassin that effortlessly controls a giant wolf, but presents herself as a classy and sexy woman in a night dress and full make up.
Villainous Crush: She looks shady and threatening as all hell, but outright proposes that Gero make her his wife, though that's implied to come with the idea of strengthening their clans, more than anything related to Gero himself.
- When she helps Kazuma she mentions that were he to successfully kill Gero, she'd look at him as her next possible mate, further confirming her interest in Gero is entirely based on his strength and position.

Poison Clan

Teruaki

Teruaki Gero

Branch Family Poison User

Hikaru and Akari's cousin. He was promised to marry her, which would have made him into the new head of the clan if Hikaru hadn't intervened.

However, he has no desire of such, and his only goal is to make sure that Hikaru is the head of the clan, which puts in his mind the idea of killing Kinosaki for "deceiving" him.

Ambiguously Gay: He's prone to blushing around and praising Gero endlessly, which leaves the impression he may have a crush of some sort on him.
Hard Work Hardly Works: Teruaki is the least talented between the three of him, Akari, and Hikaru, and even though he goes to such extreme lengths as eating the most powerful poisons ever made by the Gero family to increase his abilities he's still unable to defeat Gero.
Kick the Dog: He seemingly takes out an entire city block of civilians in order to get to Gero, but it turns out he just harmlessly put them to sleep.
Motive Misidentification: Akari's guess was that he represented a threat for wanting the position of Head of the Clan. He actually is uninterested in the position and doesn't seem to care about marrying Akari; all he wants is Gero at the position, and is willing to kill Kinosaki to eliminate that distraction.
Tragic Villain: At the end of the day, it's clear that Teruaki is ultimately a victim of the Poison Clan's dogma and harsh upbringing. It's heavily implied that Teruaki's obsessive feelings for Gero came about because he was the only one to show him kindness as a child. The "villain" part is downplayed when Teruaki manages to make peace with Gero getting married... only for his clan's superiors to psychologically pressure him back into his self-destructive behavior.
Yandere: His feelings for Gero are shown to go way beyond mere clan loyalty.

Kannawa siblings / Windwheel Clan

Kannawa Siblings

https://static.tvtropes.org/pmwiki/pub/images/mtxn_kannawa.png

A family made by the merging of the Wheel Clan and the last member of the Wind Clan. Unlike most clans, they're not bound by blood, but are made out of orphans gathered by the father of the Wheel Clan.

Happily Adopted: Despite not being bound by blood, the siblings all clearly love and care for each other.

Kazuma Kannawa

https://static.tvtropes.org/pmwiki/pub/images/mtxn_kazuma.png

Older Brother and Wind User

A wind user hired by Namegawa to kidnap Erina. The leader of the Windwheel Users.

Anti-Villain: While he serves as the main antagonist of the Akakura arc, he's shown to be a pretty great guy when it comes to matters outside of his work as an assassin and he only took Namegawa's job for getting reputation despite being disgusted by him.
Arc Villain: He serves as the main antagonist of the Akakura arc.
Benevolent Boss: He's a ridiculously great guy to his subordinates and his siblings, to the point that it's even Played for Laughs. His response to some of them losing to Gero is to yell that they should show themselves some love and take a rest.
Dragon with an Agenda: He may have been hired by Namegawa, but it's clear that he and his siblings are mainly in it to usurp the five families by defeating Gero.
Family of Choice: Kazuma's wish to make the Wheel Family recognized is not because of his birth family but rather for his adoptive father's wishes to honor his sacrifice to protect Kazuma.
Sins of Our Fathers: The Wind Clan's bloodline was hunted down due to trying to usurp the five families and Kazuma himself was hunted down until his adoptive father sacrificed himself to kill his pursuers.
Tragic Keepsake: The windwheel he keeps on his bun is a memento from his adoptive father, who died protecting him, and whose dream of turning the Wheel Family into a recognized family in the underworld he now has taken up.

Mitsuba Kannawa

A wheel user hired by Namegawa to kidnap Erina.

Hot-Blooded: Between her siblings, she's shown to have the most aggressive and fiery personality.

Kojiro Kannawa

A wheel user hired by Namegawa to kidnap Erina.

Drives Like Crazy: He's of the belief that cars don't need to have brakes, going as fast as he can and having Kazuma stop it manually.
The Stoic: Shows little to no emotion, even when driving headfirst into a building.

Gun Clan

Miyuki

Head of the Gun Clan

The head of the Gun Clan, which has been on a rampage causing massive incidents lately and spreading guns to the masses. She has plans to take a high profile party hostage for ransom money.

Amazonian Beauty: She's very fit and has even visible abs, and she looks really good.
Battle Strip: When trapped in glue by Leo's Trick Bullet, she rips off her own clothes to get rid of it, and proceeds to spend her upcoming heist covered on only lingerie and a Coat Cape.
Ms. Fanservice: At her best, she is still wearing pretty much just a sports bra, pants, and jacket, but this becomes a bigger example when she rips all her clothes off and proceeds to walk around in lingerie while she takes people hostage.

Other Antagonists

The Captain

The owner of the art gallery Gero and Kinosaki visit on their first practice date, who later kidnaps Kyoko Himekawa with the aid of Ushio the Water User.

I Have You Now, My Pretty: It quickly becomes clear that his interest in Himekawa goes way beyond her stealing back one of his paintings.

Aunt Futae

Futae Ureshino

The aunt of Shiori Ureshino, who aims to have her niece assassinated so that she can succeed her deceased elder brother as head of the family company. To do this she hires Naruko, the Sound User.

Easily Forgiven: After Naruko is defeated and Futae's assassination plan is revealed, Shiori lets her off the hook on the condition she teaches her how to run the company.

Yamada

Masahide Yamada

A man with prosthetic limbs and former enemy of Bug User who aims to blow up his wedding day.

Disproportionate Retribution: He wants to kill the Bug User's loved ones out of revenge for committing the heinous crime of... saving his life.
Even Evil Has Standards: When push comes to shove, not even he can bring himself to ruin Toshiko's wedding day.

Yukio Himi

Makoto's father trying to force her into an Arranged Marriage with Heiwajima.

Crocodile Tears: Gero accuses him of feigning sympathy to hide that he's trying to use his daughter as a tool for his own gain. It turns out to be subverted; he truly does want Makoto to be happy, even if he was very misguided about it.
Heel–Face Turn: He and Makoto break out into a mental argument during Sakazuki's Spiritual PvP, at which point Makoto is able to make him realize that she doesn't need wealth or luxury to be happy. When Sakazuki holds him hostage in order to force Makoto into marrying Heiwajima, Yukio encourages her to decline and prioritize her own happiness.
Heroic Sacrifice: He takes the fall for his crimes in order to arrest Heiwajima and his father as well with the evidence that comes to light, which would put both of them far away from Makoto and let her live on safely.
Parents as People: Although he's in the wrong for trying to force Makoto into his idea of happiness, it's clear that he truly did have her best interests at heart, even if he had a very misguided way of going about it.

Takeo Heiwajima

Makoto's fiance, the son of a prominent politician.

And Now You Must Marry Me: He has Sakazuki take Makoto's father hostage to force her into marrying him.
Evil Is Hammy: He's a massive Cloudcuckoolander who serves as the Arc Villain of Makoto's arc, forcing her into marrying him against her will.
Handsome Lech: He is actually quite good looking, but his personality is too terrible for that attribute to shine through.
Playing the Victim Card: Played for laughs in an over the top manner. He grovels in front of Makoto's father and forces him to step on him by grabbing his foot.
Villainous Crush: Chapter 75 reveals he is genuinely in love with Makoto, but is just too twisted to exhibit in any way that is acceptable. Makoto herself says that there's no way they'd be together after everything he's done. That being said, she bids him good luck in changing himself when they part ways.

Friends

Akari Gero

https://static.tvtropes.org/pmwiki/pub/images/mtxn_littlesister.png

Gero's beloved little sister. She is in a serious relationship with another girl, which was threatened by her grandmother until Gero agreed to get married.

The Bus Came Back: After more or less disappearing following the first chapter, she makes a comeback during the Akakura arc. It turns out she was on vacation with her girlfriend in Okinawa after almost breaking up with each other.
Foil: To Gero. Together with Toshiki, she has something that can severely reduce her dating pool, in her case, being a lesbian in a relatively conservative country, but is regardless able to build a strong romantic relationship with someone. Both of them serve to showcase that despite obstacles, one can still find someone to love.
Inadequate Inheritor: While her skills have yet to be demonstrated, it's been hammered home that Akari can't hold a candle to her brother at the family craft and their cousin notes Akari is only good at detoxification. It's implied that their grandmother only sees value in her as someone who can produce children to continue the lineage, and what partially motivates Akari to go along with this at first is the desire to be of some use to her brother. Thankfully, Gero comes up with a solution that allows her to live her own life.
Sickeningly Sweethearts: She and her girlfriend are absolutely all over each other.

Toshiki Hanamaki

Bug User

A member of a branch family of the Poison Clan, he is technically subservient to Gero, but is actually his closest friend and confidant.

Because You Were Nice to Me: Toshiki made an effort to reach out to Gero when he was younger after the latter refused to see him as a 'worm' to exploit, a position traditionally encoded into the power dynamic between the main and branch families. This lead to Gero having positive relationships with others beyond Akari.
Creepy Good: The scariest looking assassin in the series (including a pet tarantula that he keeps inside his face mask) but also the nicest.
Face of a Thug: He's very aware of how ugly he looks, having sharp teeth, a bald head, and bug tattoos on his face, looking very threatening. That said, he is a very sweet, kind man for an assassin.
Foil: To Gero. Together with Akari, he has a drawback in the dating game, namely being both not very attractive and being an assassin, but he is still able to find a woman that accepts him and cherishes him enough to get married to her. Both of them serve to showcase that despite obstacles, one can still find someone to love.
Pest Controller: As his specialist title might suggest, Toshiki can control bugs.
Rescue Romance: His fianceé (later wife) fell for him after he rescued her from a mountain climbing accident.

Piichi Nakagawa

https://static.tvtropes.org/pmwiki/pub/images/mtxn_piichi.png

A mysterious man that starts killing specialist assassins with a knife.

Badass in a Nice Suit: He fights while wearing a three-piece clear suit.
Bait-and-Switch: Introduced as the likely antagonist to the arc surrounding Arashiyama after killing a specialist and deciding to target Gero, as well as having slaughtered various members of the Beast Clan, but he turns out to be relatively amiable and not a threat to Gero or Arashiyama when they talk things out. He then joins the heroes to take down the actual villain: the Beast Clan's head.
Chef of Iron: He plans to cook for the cafe and spends a lot of his fights during the Beast Kingdom arc thinking about if whichever monstrous animal he's fighting would be a good addition to the menu.
Dissonant Serenity: Barely flinches when the most dangerous things are happening around him. When he and Kinosaki are attacked by a giant squid, he is easily slicing its tentacles while watching a youtube tutorial on how to properly cut a squid.
Healing Factor: Piichi can recover from even a tough battle by taking a short nap.
Humble Goal: His killing spree comes from a desire to make the world around him more peaceful, so he can achieve his dream of opening a café with his girlfriend.
Nice Guy: After seeing Gero and Arashiyama stand up for each other, he completely stops trying to kill them. He also tries to get Gero to a hospital after her overdoses on toxins, only relenting because the latter can easily fix himself up. It's shown that he only kills those he considers threatening to his and his girlfriend's dream of a peaceful environment to open their cafe, with the people he did kill revealed as pretty despicable. This is also the reason why he's targeting the Dogo Family, as he's heard they're planning something which will get a whole lot of people killed if they're allowed to carry it out.
The Power of Love: Piichi becomes even stronger after having a conversation with his girlfriend over the phone.
Serial-Killer Killer: Piichi is an assassin hunter who aims to eradicate the Beast Clan after hearing that they're planning something terrible. Along the way, he also kills many other specialists whom he deems a threat to his dream.
Superpower Lottery: Piichi is a rare genetic mutation. Assassin clans can take generations to develop their very specific techniques and genes to be able to do the impossible battle feats they do. Piichi was just born with the complete mutation, allowing him to have skills with the same level as Gero.
Super-Strength: He can slice through thick layers of concrete with a tiny knife.
Villain in a White Suit: Subverted. He turns out to be a pretty amiable guy and joins the heroes when an actual threat appears.

Erina Zao

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The daughter of a deceased crime lord who is currently being hunted by assassins. Her bodyguard, Chinatsu Akakura, is looking for a getaway driver, which Kinosaki is all too happy to provide her with.

Damsel in Distress: As a child being hunted by assassins, that's a given. And yet, somehow, she still turns into another Damsel out of Distress when, once the assassins have all been taken out, she punches and scares her own kidnapper so bad his hair turns white.
Defiant Captive: When Erina is kidnapped and held at gunpoint by her father's enemies, she refuses to kowtow to them and beg for her life, having faith that Akakura will come to save her.
Mafia Princess: The daughter of a mafia don.
Shipper on Deck: Eventually tries to push Chinatsu and Gero together, though she was dead-against it at first.

Leo Beppu

https://static.tvtropes.org/pmwiki/pub/images/mtx_beppu.png

"So, first, you need to load the bullet of love into your eyes. Then, once your potential partner notices your interest, you pull the trigger with the perfect pick up line: 'Will you be the shooting spotter of my life?' Your target will be at a complete loss here. Now, without missing a beat, you immediately flash them the famed Beppu smile and shoot them straight right through the heart."

A boisterous member of the Gun Clan that falls for Kinosaki. He is an exceptionally talented specialist and can even go toe to toe with the clan head, but can't bring himself to kill anyone.

Didn't Think This Through: He traps a fleeing Miyuki by challenging her to a duel, something she is honor-bound to accept as a member of the Gun Clan. His intention was for Gero to fight her, which would tip the scales in their favor, but as it is pointed out, this is only a rule for members of the clan, forcing Leo himself into a fight against his former boss and the strongest Gun User without Gero's support.
Handsome Lech: Despite his best skills at dating, Kinosaki is completely unfazed by him, and actually tells Gero not to follow his advice.
Ladykiller in Love: Despite boasting about his skills in romance and seducing others, he is sorely outmatched against Kinosaki's beauty and talent, to the point of falling head over heels for him. When Kinosaki teases him about needing to make a lot of money to attract him, Leo turns into a blushing mess and swears that he will make it for him.
Thou Shalt Not Kill: He can't bring himself to shoot anyone. This is why he refuses to kill Miyuki Shiragane.
Trick Bullet: Doubly so. He uses bullets that mix glue, chilli pepper, and water. The water and the chilli impair the vision of the people they hit, but in targeting the floor, the glue becomes a trap people get stuck to.

Characters / MARRIAGETOXIN

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