This list includes 36 Male costume ideas that start with O, from “Obelix” to “Ozymandias”. Many entries are pop‑culture characters, occupations, and historic or mythic archetypes for Halloween and cosplay.
Male costume ideas that start with O are themed looks for men, covering characters, occupations, animals, and historical roles. Notable examples include “Obelix” from the Asterix comics and “Ozymandias”, a name used in poetry and comics.
Below you’ll find the table with origin and required pieces.
Origin: Quick tag that tells you where the costume comes from so you can choose by theme or fandom.
Required pieces: Short list of three to six essential items to buy or DIY, helping you assemble the costume quickly.
Male costume ideas that start with O
| Name | Origin | Required pieces | Estimated cost (USD) |
|---|---|---|---|
| Obi-Wan | fictional — Star Wars | brown robe, tunic, belt, lightsaber, boots | 50–200 |
| Optimus Prime | fictional — Transformers | helmet/mask, chest armor, red/blue jacket, gloves, boots | 80–400 |
| Oppenheimer | historical — scientist | 1940s suit, tie, round glasses, pocket watch or briefcase, haircut styling | 40–150 |
| Odin | mythic — Norse | cloak, horned or winged helmet, long beard, spear or staff, eye patch | 40–200 |
| Oompa Loompa | fictional — Roald Dahl | orange body paint, white overalls, green wig, brown shoes, gloves | 30–80 |
| One Punch Man | fictional — anime | yellow jumpsuit, white cape, red gloves, bald cap, red boots | 30–120 |
| Orc | fictional — fantasy | green/brown face paint, tusk prosthetics, leather armor pieces, fur cloak, weapon prop | 40–200 |
| Olaf | fictional — Disney | white tunic or snowman suit, carrot nose, twig arm props, coal buttons, hat | 30–100 |
| Othello | fictional — Shakespeare | Venetian doublet, cloak, sword, feathered hat, boots | 40–150 |
| Odysseus | mythic — Greek | tunic/robe, leather belt, laurel or helmet, sword or spear, sandals | 30–150 |
| Ozymandias | fictional — Watchmen | dark suit, cape (optional), blonde wig, symbolic ring | 50–150 |
| Oceanographer | occupation | khaki shirt, cargo pants, field vest, binoculars, notebook | 30–100 |
| Oscar the Grouch | fictional — Sesame Street | green fur suit or green clothing, trash can prop, eyebrow makeup, gloves | 30–120 |
| Outlaw | archetype — Wild West | duster coat, cowboy hat, bandana, toy revolver, boots | 30–150 |
| Officer | occupation — generic | uniform shirt, badge, hat, duty belt, handcuffs | 30–150 |
| Ostrich | animal | inflatable or full-body ostrich suit, beak/headpiece, leg covers | 30–180 |
| Ox | animal | horned headpiece, brown fur vest, tail, hooved shoe covers | 25–80 |
| Owl | animal | feathered cape or jacket, owl mask, talon gloves, beak accessory | 30–120 |
| Ocelot | fictional — video game | trench coat or leather jacket, revolver prop, gloves, sunglasses, ponytail wig (optional) | 40–150 |
| Oni | mythic — Japanese | horned mask, kimono or robe, club (kanabo) prop, red/blue body paint | 30–150 |
| Orpheus | mythic — Greek | tunic, laurel, lyre or small harp prop, sandals, cloak | 30–120 |
| Oberon | fictional — Shakespeare | regal doublet, crown, cloak, wand or scepter | 50–200 |
| Orange Power Ranger | fictional — Power Rangers | orange ranger suit or jacket, helmet or mask, gloves, boots | 40–250 |
| Oddjob | fictional — James Bond | dark suit, bowler hat, metal-looking throwing hat prop, gloves, tie | 30–150 |
| Oogie Boogie | fictional — The Nightmare Before Christmas | burlap sack suit, burlap mask, dice prop, green lighting makeup | 40–200 |
| Octopus | animal | tentacle costume or cloak, headpiece, suction-cup detailing, matching gloves | 30–150 |
| Odo | fictional — Star Trek | security uniform, bald cap, shapeless neutral-tone makeup, communicator badge | 40–150 |
| Oliver Twist | fictional — Dickens | Victorian shirt, waistcoat, flat cap, trousers, scarf | 30–100 |
| Oscar Wilde | historical — writer | velvet suit or frock coat, cravat, pocket watch, cane, floral boutonniere | 40–150 |
| Old Hollywood Star | archetype — 1920s–50s | tuxedo or suit, slicked hair, cane or cigarette holder, pocket square | 50–300 |
| Oogway | fictional — Kung Fu Panda | tortoise headpiece, long robe, staff, white beard | 40–150 |
| Oz | fictional — The Wizard of Oz | emerald robe or suit, top hat, cane, theatrical makeup or beard | 40–200 |
| Osiris | mythic — Egyptian | nemes headdress or crown, Egyptian collar, crook and flail props, robe | 40–200 |
| Obelix | fictional — Asterix | striped trousers, wide belt, blue helmet or cap, prop menhir or club | 40–150 |
| Otter | animal | brown fur jumpsuit or vest, otter headpiece, tail, whisker makeup | 30–120 |
| Octavian | historical — Roman | Roman toga or tunic, laurel wreath, gladiator sandals, sash | 30–150 |
Descriptions
Obi-Wan
Classic Jedi costume: layered tunic, cloak and lightsaber make this instantly recognizable for Star Wars fans and easy to DIY or buy premade.
Optimus Prime
Iconic robot leader look—full armor or simple mask and chest panel options suit cosplayers and Halloween-goers alike.
Oppenheimer
Subtle, cinematic costume: a period suit, vintage accessories and slicked hair recreate the famous physicist’s look.
Odin
Regal and dramatic Norse god outfit—mix mythic props and a heavy cloak for a powerful, masculine costume.
Oompa Loompa
Fun and instantly recognizable for groups — requires body paint and wig; great for couples or themed parties.
One Punch Man
Saitama’s minimal superhero look is easy to DIY: bald head, yellow suit and cape make it a standout, cosplay-friendly choice.
Orc
Versatile fantasy staple—face paint, tusks and rugged armor create a battle-ready orc for conventions and Halloween.
Olaf
Warm-hearted, goofy snowman costume that’s family-friendly and easy to assemble with simple props and a padded suit.
Othello
Dramatic period costume from the Shakespearean tragedy—perfect for literary-themed events or elegant masquerades.
Odysseus
Classic Greek hero look—tunic and simple armor pieces evoke the wanderer king for historical or mythic parties.
Ozymandias
Stylish and mysterious Watchmen costume: tailored suit with subtle heroic or villainous props for comic fans.
Oceanographer
An easy, modern costume for science lovers—field-ready clothing and accessories make this practical and approachable.
Oscar the Grouch
Playful, trash-can-dwelling character—green fur and a can prop create a nostalgic, humorous costume.
Outlaw
Rugged Western look that’s customizable—bandana and hat instantly signal outlaw vibes for parties and themed nights.
Officer
A straightforward uniform costume that’s easy to source; specify police, security or military variations for clarity.
Ostrich
Novelty and comedic option—inflatable or mascot-style suits make this a hilarious party staple.
Ox
Simple rustic animal costume—horns and fur pieces provide an easily assembled barnyard look.
Owl
Mysterious, stylish costume—feathers and a mask can be elegant or creepy depending on makeup and colors.
Ocelot
From games to fashion, Ocelot-inspired looks range from animal prints to the revolver-wielding character’s trench coat and attitude.
Oni
Striking folkloric demon costume—bold paint and a fearsome mask create an intense cosplay or Halloween look.
Orpheus
Mythic musician costume—simple classical garments and a lyre evoke the legendary poet and singer.
Oberon
Fairy-king elegance from A Midsummer Night’s Dream—ornate fabrics and crown create a theatrical, royal costume.
Orange Power Ranger
Bright, action-ready costume for fans; full suits or themed jackets work for parties and cosplay.
Oddjob
Classic Bond henchman costume—recognizable for the lethal hat and slick suit combo.
Oogie Boogie
Grotesque yet playful villain costume—burlap texture and dice props make this a standout Halloween pick.
Octopus
Eye-catching sea creature costume—multi-tentacle suits or DIY tentacles provide dramatic movement.
Odo
Shape-shifting constable from DS9—costume focuses on a uniform and distinctive bald, smooth look.
Oliver Twist
Classic Dickensian orphan look—great for literary or period-themed parties with easy thrift-store sourcing.
Oscar Wilde
Dandy aesthetic—Victorian flair and witty persona make this literary costume stylish and recognizable.
Old Hollywood Star
Glamorous retro look—think tux, polished hair and suave accessories for a red-carpet vibe.
Oogway
Wise, gentle kung fu master costume—robe and wise-elder props capture the beloved character’s spirit.
Oz
The Wizard persona offers many styles—from grand stage magician to mysterious figure behind the curtain.
Osiris
Ancient Egyptian god costume—ornate collar and headdress make for a striking, culturally rooted look.
Obelix
Beloved comic book strongman—big belt, striped pants and a menhir prop create a humorous, bold costume.
Otter
Cute and approachable animal costume—soft fur pieces and facial makeup make this an easy option.
Octavian
Roman-statesman look (name invokes Octavian/Augustus)—classic toga and laurel create imperial gravitas.