Posted by Jasper Castelein on October 07, 2026

What Are Funny Halloween Costumes for Men?

Jasper Castelein, OppoSuits

Published October 7, 2026 • 11 min read

Quick answer

Funny Halloween costumes for men work when the joke lands from across the room. At OppoSuits, a Dutch novelty-wear brand, we make licensed onesies that do this: the South Park Cartman Onesie, the Scooby-Doo Onesie and the Lion Onesie. You step in, zip up, and need no props or face paint.

South Park™ - Kyle Onesie

I get asked about funny costumes every October, usually by someone who has left it late and wants a laugh without a trip to three shops. My answer is nearly always a onesie. It is one piece, it is warm, and nobody asks who you are meant to be.

The costumes below are ones we make at OppoSuits, in Roelofarendsveen in the Netherlands. I have ranked them by how fast the joke lands, how easily you can sit, dance and queue for a drink in them, and how the humour plays with a UK crowd at a house party or a pub night.

Funny is harder than it looks. A clever idea that needs a two-minute explanation loses to a character everyone knows. So the picks here are about getting the laugh quickly, then letting you enjoy the night.

A funny Halloween costume is one a stranger can name in about two seconds, so choose a character the whole room already knows and skip anything that needs explaining.
Cartman suits a loud house party where friends know the show, while Kenny and Kyle fill out a South Park group of three.
The Scooby-Doo and Lion onesies need no fandom, which makes them the safer picks when the crowd does not follow cartoons.
A one-piece onesie means no props to lose and no outfit to assemble, but plan for the toilet and wear thin layers underneath to stay comfortable.
Choose one standout joke per group rather than five competing costumes, and order on a weekday before 16:30 for next-day delivery.

What makes a Halloween costume funny rather than just silly?

A funny Halloween costume is one people recognise in about two seconds, and if you have to explain it, the joke has failed. Silly costumes ask the room to work something out. Funny ones hand over the punchline before anyone speaks.

Characters people already know do most of that work for you. Cartman, Scooby-Doo and a lion all read from across a crowded room, so you never need a name badge or a speech at the door.

My test is simple: could a stranger name your costume from the other side of the pub? If the honest answer is "maybe", pick something louder.

Comfort matters more than most people admit. A joke you cannot sit down in only lasts an hour, then you are standing by the wall with a drink you cannot reach. A soft one-piece lets you dance, perch on a sofa and queue at the bar without thinking about it.

Props are the other trap. A mask, a prop sword or a bag of accessories gets lost, dropped or left in a taxi by 10pm. A Scooby-Doo Onesie is the whole costume in a single piece, so there is nothing to carry and nothing to forget.

Which South Park onesie gets the biggest laugh?

The South Park Cartman Onesie gets the biggest laugh of the three South Park characters we make. It turns Eric Cartman into a full, wearable onesie, and the character is recognisable from across a crowded room.

Cartman is the right pick if you want to be the centre of the room. The character is loud and rude, and a grown man dressed as him gets the joke across before he says a word. I would choose it for a lively house party where your mates already know the show.

Kenny and Kyle suit a different kind of night. Kenny is the quieter, drier joke, the kind people spot a second later and then point at. Kyle is the straight man of the group, which makes him a good partner for a friend who takes Cartman. If your group wants to split the characters, these two fill the gaps.

All three are officially licensed, so the character print is the official South Park artwork. That matters for the joke. A knock-off with the wrong colours or a off-model face makes people squint instead of laugh, and a squint costs you the laugh.

Scooby-Doo™ Onesie

What if I want a funny costume everyone knows without a franchise?

Pick an animal or a cartoon detective: the Scooby-Doo Onesie and the Lion Onesie both get a laugh without anyone needing to follow a particular show. The joke is the character, not the plot.

The Scooby-Doo Onesie is the mystery-solving crowd pleaser. Almost everyone in a UK pub or house party knows Scooby-Doo from childhood, so the recognition is instant. It works on its own, and it works as a pair if a mate turns up in a different outfit and plays the one who is always spooked.

The Lion Onesie is the animal option. It is big, soft and readable from the other side of the room. The humour is simple: a grown man in a lion suit, looking completely committed to it.

Animal onesies suit anyone who does not watch cartoons or follow franchises. Nobody needs to know a show to get the gag, so the joke has no fandom to fail on.

How do I compare funny costumes on comfort and effort?

The real difference between these onesies is how they behave once the night gets going, not how long they take to put on.

I judge each one on four things: can you dance in it, sit down comfortably, queue at the bar, and manage the toilet without a struggle. A loose, one-piece cut passes the first three easily. The toilet test is the one to plan for, so wear light layers underneath and give yourself time.

Effort and practicality for each onesie costume

Costume	Pieces to assemble	Accessories needed	Works without knowing the franchise
South Park™ - Cartman Onesie	One piece	None needed	Mostly no
Scooby-Doo™ Onesie	One piece	None needed	Yes
Lion Onesie	One piece	None needed	Yes
South Park™ - Kenny Onesie	One piece	None needed	Mostly no

Warmth is the other deciding factor. Late October evenings in the UK are cold, and a onesie is warm by design. For a long night out with a queue outside, I would pick the Lion Onesie, since it is the warmest-looking choice and nobody needs to know a show to get it.

For an indoor house party, where it gets hot and crowded, the Scooby-Doo Onesie is the one I would wear. Keep the layers underneath thin, and you can dance all night without overheating.

How do I pick a funny costume for a group or a party theme?

Pick one joke per group and let each person play a different part of it. A South Park trio works well: one friend wears the South Park™ - Cartman Onesie, another the South Park™ - Kyle Onesie, a third the South Park™ - Kenny Onesie. Three people, three characters, no one matching.

If your group is bigger or mixed, pair the Scooby-Doo Onesie with a mate in a different outfit. You get the "gang" joke without everyone dressing the same, and the person next to you becomes part of your gag.

Choose one standout rather than five similar costumes. Five onesies from five different franchises compete for the same laugh, and nobody remembers any of them. One strong character, or one small set of linked ones, reads clearly from across the room.

Agree the theme before anyone orders. Weekday orders placed before 16:30 arrive the next day, so the group can settle it late. For a quick look at the full range, browse the Halloween outfits collection.

Funny Halloween onesies for men compared by joke, crowd and best setting

Costume	The joke	Who gets it	Best for
South Park™ - Cartman Onesie	The loud, rude character everyone loves to quote	Fans of the show	Lively house parties
South Park™ - Kenny Onesie	The dry gag people spot a second late	Anyone who knows the show	Group costumes
South Park™ - Kyle Onesie	The straight man standing next to the chaos	Fans of the show	Group costumes
Scooby-Doo™ Onesie	The nostalgic mystery-gang favourite from childhood	Almost everyone	Pairs and mixed groups
Lion Onesie	A grown man fully committed to being a big cuddly animal	Everyone, no fandom needed	Long nights out

Which funny onesie should you order for Halloween?

Pick the Scooby-Doo Onesie if you want the joke most people get, or the South Park Cartman Onesie if your friends know the show and you want to be the loudest person in the room. Both are ready to wear the moment they arrive.

The one thing that changes this is the crowd. If nobody at the party watches cartoons, take the Lion Onesie, because the gag needs no fandom at all.

Decide on the character first, then check your size against the size guide. Place the order before 16:30 on a weekday and it arrives the next day.

Run through this list before you order, and the costume should sort itself out.

Name the one character everyone at the party will recognise.
Check the party venue: indoor warmth or an outdoor queue.
Choose a South Park character if your group can split Cartman, Kyle and Kenny.
Pick Scooby-Doo or Lion if the crowd does not follow TV shows.
Check your size against the size guide before ordering.
Order before 16:30 on a weekday for next-day delivery.
Keep accessories to nothing so you have nothing to lose.

What size onesie should I order if I am between sizes?

Size up if you are between sizes, because a onesie that is slightly roomy still looks right, while one that is tight across the shoulders or in the seat makes sitting and dancing a chore. Check your measurements against the size guide on the product page before you order. If you plan to wear a jumper or thermal layer underneath, that is another reason to go larger.

Can I wear a onesie to a Halloween party in a pub or club?

Yes, a onesie is fine at most Halloween nights in pubs and clubs, since fancy dress is the whole point of the evening. Check the venue's dress code first, because a few clubs ban full-face coverings or have a strict cloakroom policy. A onesie has no mask, so it rarely causes trouble on the door. Ask whether there is a cloakroom, as a big costume is easier to leave behind if the dance floor gets packed.

Are the South Park onesies officially licensed?

Yes, the South Park™ onesies we make, covering Cartman, Kyle and Kenny, are officially licensed products. The same goes for our Scooby-Doo™ onesie. Licensed means the character artwork is approved by the rights holder, so the faces and colours look the way fans expect. You will see the ™ mark in the product name on each page.

How do I stay cool wearing a onesie at a crowded party?

Wear only a thin, breathable base layer underneath, such as a light cotton t-shirt and shorts, and skip anything thermal. Unzip the front a little when the room heats up, and step outside for a few minutes every hour or so. Drink water between rounds. A onesie holds heat well by design, so these small habits matter more than they would in a jacket.

Do the onesies work for Halloween and carnival nights too?

Yes, the onesies in this range are tagged for both Halloween and carnival, so one purchase covers two occasions. Carnival is the Dutch and Belgian pre-Lent celebration, and a onesie suits its long days of street parties, where you want comfort and a costume people recognise at once. Wear it again for a themed birthday or a fancy dress night with friends. Keep the same thin layers underneath and the outfit works in any of those settings.