Ghost

Pierrot

We don't know about how the circus member's fight or if they ever have to, but they for sure have planned and coordinated it. Pierrot would more or less be on offence in a fight since he is the strongest, but strays to more defense depending on how the fight is going in a group.

Because he often fights with brute strength and close combat tools, he's not skilled in long range or speed-based fights. So, if you were trained in martial arts or archery, Pierrot would not only find that incredibly fascinating, but very attractive.

He'd love to learn from you, even if you fought similarly to him. Since he's never been formally trained and you're a professional, there's definitely some tricks and moves you could show him. He'll hang on your every word and practice until he can fight just like you! Plus, if worse comes to worst, he now knows how to better protect anything that tries to hurt you or his family.

Also please spar with Pierrot and knock him down. Trip him up or parry him just enough to get him to fall on his ass, because seeing you standing over him gets him closer to heaven.

Harlequin

In a big fight, Harlequin seems to be the one to pick off opponents. He's the quickest on foot, so he'd likely circle around a group and strike when he sees an opening, like an ambush predator. He'd probably do well in close combat as well, but against a particularly strong and big human, he'd need to have the upper hand. If he's cornered or pinned, Harlequin would likely have to wriggle away before going back to lurking.

Because of his strength and speed, I don't see him listening to a professional fighter like yourself. Sure, he might listen if you point out that his form is off or that he could make a few tweaks here and there, but that's about it. He learns how an opponent moves fairly quickly in a fight, so he trusts himself to adapt.

Though Harle won't say no to you showing him some of your own moves. Hell, he might just mimic them if it means you'll touch his arms or shoulders to correct his posture. Or he'll trip you up and laugh at your face when you fall.

If you manage to knock him down, it's because he let you in all honesty. Being pinned down in combat is usually bad news for him, so if he's below you at any time, it's because he is playing with you.

Like how a cat shows you its belly.

Ticket Taker

Now when it comes to Ticket Taker fighting, it varies immensely. If it's a fight outdoors or without many or any reflective surfaces, Bil would stay back in a fight as support. Physically, he's the weakest of the bunch, but still stronger than the average human. Which makes him perfect for overall support like grappling or pinning, or even being a distraction for the others to intercept.

Besides, that suit he wears doesn't give him the most mobility, so support is still better for him in a large fight. Though if his power of illusions go beyond just reflections or himself, then I see him using it to his advantage.

Now if it's within the circus, or worse in his tent, he doesn't need strength. His mirrors are enough to confuse anybody, which gives him the upper hand when they're stuck running in circles. Based on that shadow in his mirror, and the fact that he can travel through them, he's likely able to pull an enemy through a reflective surface to trap them.

When it comes to you fighting with Ticket Taker, the most he'll do is watch you in interest. He knows his strength better than anybody, and despite you being a professional, wouldn't see learning from you to be a necessity. Ticket Taker will watch you train or spar with the others but won't join in a session.

If you were to try and convince him to spar in his tent, however, he might indulge you. It's mostly to entertain himself, though, because seeing you get so excited to fight only to end up bumbling around like a dummy is priceless. Just don't break a mirror.

Jester

Jester is also a bit of a wildcard with fighting as we don't know much about his abilities. The most we know as of now is that he can hypnotize (or some equivalent) multiple people at a time and is on par with Harlequin in terms of raw strength.

Because of this, I see him being similar to Harle when it comes to fighting. Akin to an ambush predator, Jester will lurk, distract, and pin down an enemy with his eyes until they're unable to resist his influence. From there, he'd use the victim as a traitor to their group, a meat shield, or maybe an impromptu snack if it's a one-on-one fight.

Though I also see Jester leaning more into offence with Pierrot in need be, though I'm not so sure if he's skilled in a particular weapon like Pierrot is with his knives. (Maybe he'd use those clawed gauntlets that the Fool in his show used? Eh, maybe he wouldn't need them.)

Since Jester is well-wounded when it comes to fighting, I don't see him being very keen on fighting with you. He'll definitely find it interesting —perhaps impressive— that you've learned how to fight to a professional level but would prefer to stay on the sidelines. He'd pay extra close attention if you were to spar with the others, though so long as you don't draw blood or make bruises, he won't intervene.

Doctor

Doc is big, anyone can see that. He's tall and broad, and a body like that doesn't go without some serious strength. This might sound a little obvious, but I think Doctor would do very well as defensive in a large fight, but also as a kind of tank. Doctor is a large target and easy to hit, especially with him likely not being very fast, but he can deal with the pain in a fast-paced fight. Why? Because he's much more concerned with the intoxicating scent of adrenaline in the air from all the participants, and when someone inevitably sheds blood? You better get out of the way, lest you come face-to-face with a red-eyed Doctor with claws that could break your femur like a pencil.

Though, of course, Doctor is a gentle giant at any other time.

When you tell him about your grand skills with fighting, Doctor will be very interested to learn more. That doesn't really mean he'll use what he learns from you or mimics it, but he might take some and practice them for later. Doc is mostly interested in soaking up whatever information you can give him; plus, watching you train gives him a good opportunity to track your heartrate during exercise.

If you were to try and spar with him, he'll take you up on it, just not in the way you'd like.

He'll hold back a lot, more than Pierrot would. He has to, he's literally twice your size and could crush you if he were to lose his footing. So, instead of hitting you back, Doctor would prefer to practice dodging or parrying attacks.

Your bestie is about to put your head through a wall

They are painfully aware of how much stronger they are as a monster compared to you, a human, and therefore is very protective. You're their best friend and you help them hide and live amongst humans with no judgement or animosity, which has led to you being precious to them.

So, when the circus comes to town and they sniff out fellow monsters, they're on guard immediately. They likely scoped it out first to get confirmation, and when they saw the members and the unsettling Fools, they made sure to remember faces.

"MC, I'm telling you —they're not human. They might be entertaining humans, but there's no telling what they're doing to those weird pink guys. Those are humans. Don't go there, alright? It's not safe."

"Oh, well, I dunno about that. One of them gave me a ticket, a paper flower, and the other gave me a pin of his. See? Oh! And the one who gave me the ticket had me promise to go to his show—"

"You fucking WHAT-"

Needless to say, they don't want you going. That pin is clearly a mark, the gifts are some attempts at courting, and that show you promised to go to like an idiot is the exact place they do NOT want you to go.

But, of course, you want to make good on your promise and go anyway, but not without your friend in tow.

Any time you go to the circus, they go with you. They don't plan on attacking the circus members, not unless they really need to. All they'll do is guide you away from them as much as they can, like hurrying you through the blue tent or preventing you from following Harlequin. You call them a buzzkill, they call you a moron.

The circus members would all catch on pretty quickly to what was happening, and only Pierrot would be bothered by it. He'd make attempts to befriend your monster bestie in hopes of showing that he means no harm, but he might as well be talking to a wall. Harlequin would make a game out of it for sure, with snatching you away to make both your bestie and Pierrot scramble after him.

Doctor would be interested as to why an unfamiliar monsters scent is on you when you enter his tent, but as he walks you out and sees the hidden beast guarding the door, he's quick to understand. Ticket Taker and Jester would likely take more interest in you, both for Pierrot and Harlequin's fascination with you, and because of your friend. I think they'd both be pleased to see that a human is friends with a monster and vice versa, but for slightly different reasons. On some level it would ease the bitterness that lingers in Jester's heart for humans, while for Ticket Taker, it might just give him a dollop of hope.

Of course, don't think that that means you'll be treated any differently than a regular human. Sure, their eyes will be on you more than others, but you will still be kept at arms length.

And unless you can convince your monster friend to lay off playing chaperone, they likely will always be at your heels when they're around.

"MC, for Gods sake, he broke into your apartment! Him being sweet and cute doesn't excuse that! Wait— is that a bite mark DID HE BITE YOU-?!"