Kurt ruined Gatlin's human life, which he considered incredibly precious, so Gatlin despises him with white hot rage. Despite this, he has to play nice, because otherwise, Kurt might out him as a vampire and ruin what's left of his "human" life (and lie).

As much as he wanted Kurt dead, Gatlin didn't intend on ever killing him, as he's simply not a killer, but he accidentally inadvertently killed him by means of a Shadow Creature consuming him... It haunts Gatlin to this day. Of course, Kurt continues to hurt him, even after he's gone.

Kurt finds Gatlin to be insufferable, so goofy and idiotic, and obsessed with staying human, even after he becomes a vampire, which Kurt finds far superior.

But while he hates his personality, he likes Gatlin for one thing: his money and social status. Gatlin is a piggy-bank to him, not a person, but he's such a good piggy-bank.

Due to his distaste of Gatlin's personality, they rarely interact outside of him asking for money, or occasionally just to torment him, when Kurt feels like he needs to go on a power trip.

Gatlin never wanted kids, so he initially only gives Roulette attention because that's what a good dad does.

But once she starts laughing at his silliness, he realizes a kid is perfect for him: someone ever-present that has no outside job to distract her from him. It's perfect!

He gives her constant attention, and often puts her in ads for his casino, both because being a family man sells and because he just wants to show her off. As her brain develops, Roulette starts loving the attention as well.

He continues his closeness throughout her childhood, and is disappointed when she starts distancing herself from him in middle school. He keeps poking his head into things, not backing down as much as he should, but forcing himself to give her at least a little space. Sometimes. But he wants the Roulette who adored his stupid antics back. 😢

As a younger kid, she adores everything about him, from his goofiness to his fame to his general kindness.

Once she's in middle school, peer pressure makes her pretty embarrassed of him, other students often bringing up how weird he is. Perhaps someone even (ILLEGALLY) subscibes to his OnlyFans for the sake of making fun of him, which makes things a LOT more awkward and embarrassing.

As an adult, post-college, she accepts his goofy side more again, but still doesn't idolize him like she did as a kid. She still wishes he'd be more serious, but he can accept he just likes being a clown, and that's okay.

Diethard is one of Gatlin's least favorite people, all because Gatlin blames him for "messing up his life," though moving to Germany. Gatlin's life has improved greatly from there, but he still holds the grudge.

He will actively go against whatever Diethard offers he do, just to pettily get back at him. He doesn't treat anyone else with such disdain.

Diethard is not the best with his words, his attempts at nudging Gatlin a specific way not being too subtle, but he means well.

Gatlin would like Letizia well enough, if she discarded Diethard, but she doesn't, so he groups her in with her husband. Not a fan, but he'd pick her over his dad any day. At least she tries to be nice. (He's biased; Diethard tries to be nice too; he just fails.)

Letizia dotes on Gatlin, but Diethard's views take precedent, leading her to usually siding with Diethard, much to Gatlin's chagrin. She does often send him gifts, which he tends to throw out or give to someone else.

He adores how she was honest with him from the start instead of sucking up to him because he was her rich boss. They banter constantly, Gatlin normally being the butt of the jokes, and he loves it, outside of a few jokes that hit a bit too close to home (especially about his weight). He crushes on her, even after he gets married, and she technically crushes back, but knows they’d never work out, due to her being asexual and him… not being that at all. He still thinks they could work out. (They wouldn’t.)

Gatlin’s favorite employee and potentially the only woman he loves romantically. Her insults sometimes do genuinely sting him, but she’s a very needed level-head for the eccentric weirdo, one of the few people who can reign him in. Nina's the straight man to his clown, and they both enjoy their roles to the fullest. While she does genuinely love him (platonically), she will also gladly make him pay for things, knowing she can get away with it, because him tossing money around willy-nilly is all part of another big "joke" to him.

Nina does technically crush on Gatlin romantically, but she knows they'd never work out, thus rejects him at every turn. On the bright side, his constant flirting met with rejection tends to be part of their jokey straight man/funny man relationship, so it tends to not hurt Gatlin all that much. When it's part of the joke, he revels in the rejection, if anything.

Gatlin isn't super close to Ignace, but enjoys the chats they happen to have. He's not nearly as big into drama and "tea" as Igance is, but he'll try to remember anything he hears, just for Ignace's sake, sometimes using drama knowledge as bribery to get him to do stuff.

Ignace finds Gatlin to be one of the better employers he's had, given Gat's very lax and talkative: two things Ignace really likes. He talkes drama with him often.

Gatlin loves him, but more as a target to tease than a person. He does trust him a lot, and thinks he does good work.

Liam is a goody two shoes, which doesn't fit well with Gatlin's more chaotic personality, though Liam does trust that Gatlin meanas well and simply doesn't care as much about rules. He'd rather not work for Gatlin, but his own morality against lying has made him feel obligated to work for him, and Gatlin just lets him, despite knowing this. Gatlin finds it funny.

Out of all my named employees, Gatlin interacts with Mark the least, as he's too chill to be fun to mess with. He does like him, and sometimes rambles to him when upset. Knowing he's friends with Nina, he'll often talk about her with him, including his feelings and his dreams of one day dating her.

Mark is very chill, and working at the casino is just a job to him. He doesn't have much of an opinion on Gatlin one way or another except that he thinks he pays well and is quite generous at Christmas.

Gatlin doesn't know Morris particularly well, but he likes almost everyone by default, thus likes Morris. He talks to him on the job pretty often, which Morris would prefer didn't happen.

In Gatlin's main canon, Morris is NOT a Tiefling, and he's a contracted mechanic Gat occasionally hires. They don't interact much, but they get along well enough, with Morris holding some ill will towards him, simply because he's a rich idiot who wastes money as a "joke." Morris might take advantage of him on occasion, by casually mentioning some sob story (pretty emotionless about it all the while), but it's nothing too extreme.

Gat "likes" Absit, but also can't stand how passive and soft-spoken he is. He wants to "fix" him. Gatlin constantly invites himself into Absit's home, causing the man quite a lot of distress.

Despite them not liking each other, Gat interacts with his neighbor very often, determined to "fix" him, by forcing him out of his shell—just like Marius did to him, years ago. He figures it if worked on him, then it should be the same for anyone else, and they'll thank him later. Gatlin claims, even to himself, that his "bullying" is for Absit's own good, but deep down, he does take sadistic glee from it. But nooo, everything he does is for Absit's sake. He's a Good Samaritan! It's not malicious!

Gat will also often hire Absit for freelance fashion work, when he wants a new outfit, or to alter an existing piece.

Absit is soft-spoken and shy, while Gatlin is the opposite, and very forceful about it, rarely leaving Absit alone when he sees him. This makes Absit dread every frequent encounter they have.

Despite not liking him, Absit does put up with him, because he's very bad at saying 'no' to things.

Gat and her get along a lot better than him and Absit, because she's very carefree and gullible, often excitedly going along with any crazy plans Gatlin has, even if it's against her uncle. That said, Idunn can sometimes even be too much for him, given she has a lot less concerns with actual criminal acts: namely, physical attacks, property damage, and stealing. He likes her at base, but if she starts going too far, he can quickly become uncomfortable. It's a gamble.

He tries to get into her pants (because he tries to get into most people's pants), but Absit thankfully does put his foot down with that, knowing Idunn can't really consent.

Idunn loves Gatlin, because he's a big enabler, especially when it comes to messing with her uncle, Absit . He's one of her favorite people for that reason, along with him just being funny.

Unlike most of his targets, he prefers messing with Zane in more subtle ways, like doing the opposite of what Zane asks him to do, or telling a neighbor "That Lune guy would love it if you do this," knowing full well it'll irritate him. He's very much a troll, and enjoys making Zane seethe without having to even say anything to his face. He'll often feign ignorance when confronted, knowing that upsets Zane too.

The prudish Zane dislikes Gatlin at base, and utterly despises him once Gat realizes this and starts messing with him. Gat finds Zane insufferable and loves it, because that makes him the perfect "target" for his antics, without having much pushback from others. If Zane finds a way to hit Gat where it hurts (his casino, probably), they could have a mutual hatred. That'd be fun.

Gatlin likes Deems... as an easy bullying target, because the judge is both gullible and overreactive: a wonderful combination.

Once Deems loses his judge position, the two end up running into each other at a theater tryout, but Deems leaves when he notices Gat's involved. Realizing they have a shared hobby, Gat tries to genuinely befriend him, and they become actual friends, though Deems continues to play tsundere, claiming it's only because he pays for everything. Gat still bullies him, but is softer than before.

Deems initially hates Gatlin, and I'm thinking at some point, he screams "I better not see you in court!" and Gatlin figures it's some dumb threat, only later learning he's a judge, when he goes to court for a defamation case.

When Gatlin later tries to befriend him, Deems initially only bites because of Gatlin's money, but in time, they become actual friends, though Deems continues to play tsundere, claiming it's only because he pays for everything.

Liv brings out the worst in Gat; when they're together, he tends to match her levels of immaturity, leading to a lot of accidental bullying and harassment of others. They mean no harm, but do rationalize people "need thicker skin" when they get complaints.

They have zero romantic interest in each other, but Gatlin has sexual attraction, and Liv did too, until he got fat. She still enjoys sex with him, but more as yet another joke. She makes fun of his weight a lot (in and out of bed). It makes him uncomfortable, but he grins and bears it, not wanting to be a hypocrite. He wishes the attraction was mutual again...

Liv loves Gat, because he rarely pushes back against her antics and will often join in instead. He's the ultimate immature drinking buddy.

Liv was sexually attracted to Gatlin until he got fat. Now she just finds him funny. She teases him about it all the time, which makes him uncomfortable.

Gatlin idolizes him to an unhealthy degree, and has adopted some of Marius’ traits: namely the never-ending confidence and trying his best to let nothing phase him. The problem stems from the fact that, unlike Marius, Gatlin does have bouts of uncertainty, which makes him feel inadequate. Little does Gatlin know that Mairus has ASPD, which makes the whole “I don’t care about others’ feelings” a lot easier.

Marius himself “loves” Gatlin, but only superficially. He thinks of every person as a complex puzzle, and his main joy in life comes from cracking these puzzles, bettering their lives through his manipulation. His intentions may be selfish, but the end result of his work is selfless. Gatlin was one of his two big projects, the other being his own husband. He would care very much if Gatlin were to die, but there’d be no empathy behind that disappointment; it’d be like his favorite show getting canceled.

Gatlin "likes" uptight people because they're fun to bully. As a person, Gatlin thinks he's way too obsessed with some apocalyptic future he won't live to see, when he should focus on the present! Live a little! You can waste a little bit of stuff, and still be a good person. It's fiiiine!

Rolf finds Gatlin insufferable, and only puts up with him because he's one of Marius' closest friends.

Gatlin could die, for all he cared—except that would hurt Marius. Damn...

Gat "likes" Morris, just as a (for now) diligent employee. He's one of his more skilled employees, already used to sneaking around and breaking into things.

In Morris' Tiefling Monochrome canon, Gat's a much more heartless crimeboss (still with a jokey side, but it's SCARIER), and there, Morris is an employee and actively despises Gat. Gat is responsible for his missing horn and damaged eye. Morris doesn't show his anger, but waits for the day he can one day torture the man in revenge. But until then, he'll quietly bide his time, and be an overall diligent employee.