N/A

First entry. 1v1 2D fighter based on the visual novel “Umineko When They Cry”. Absolutely amazing game that was so great it basically ended the golden age of doujin games (yep, that’s my thesis). Delay based IP necode. Next entry is “Ōgon Musōkyoku X”

Ōgon Musōkyoku †CROSS (Umineko no Naku Koro ni Saku ~Nekobako to Musou no Kyoukyoukyoku~ version)

黄金夢想曲†CROSS

07th Expansion / Entergram

2021 (01/28)

PlayStation 4, Switch

Blu Ray (PS4), Game Card (Switch)

N/A

Retail

Commercial

Ryujinx (Switch)

N/A

Parsec

N/A

Fourth and final entry. Compilation that has “Ōgon Cross” but it’s actually a new update that changed the balance considerably (see website for a list of changes). These changes has never been moved to the Steam version. This version runs in Yuzu but randomnly hangs. Works better in Ryujinx

Ōgon Musōkyoku X

黄金夢想曲X

Alchemist

2011 (10/06)

Xbox 360

DVD

N/A

Retail

Commercial

N/A

Ōgon Musōkyoku †CROSS (Umineko no Naku Koro ni Saku ~Nekobako to Musou no Kyoukyoukyoku~ version)

N/A

Parsec

N/A

Second entry. Update released exclusively for Xbox 360 that was obsolete just two months later with the release of Cross lol. Game seems to run just fine on Xenia (tested by myself for 15 minutes, as it has no entry on the Xenia compatibility list). Next entry is “Umineko: Golden Fantasia”

Ojōsama Densetsu

お嬢様伝説

Kizawaya

2007 (10/19)

Windows

Download (zip file)

N/A

Doujin

Freeware

N/A

2024/2/12 update

Parsec

N/A

1v1 or 2v2 2.5D fighter with an all-female cast, created by an ex-Team Arcana/Examu staff. Not bad and very combo friendly. Had a surprise 2024 update after so many years, mostly to make it run on modern Windows versions. Dev is working on a sequel?

OloFight

The Real Ologram

1998 (??/??)

Amiga

Floppy Disk

N/A

Indie

Commercial

FS-UAE

N/A

Parsec

N/A

1v1 2D fighter made in Italy using 3D pre-render models. Visually impressive for the platform but plays like crap, in fact this feels like dejavu with what happened to Rise of the Robots but now no one cared at this point, it was 1998 after all

Omen of Sorrow

AOne Games

2018 (11/06)

PlayStation 4

Blu Ray

Switch, Epic, Steam, Arcade

Indie

Commercial

Yuzu/Ryujinx (Switch)

Steam version

2024/05/08 patch

Original game netcode

1v1 2.5D fighter made in Chile with characters based on horror films, literature and mythology. According to the devs gameplay was inspired in UNIB. Reception was mediocre to bad. Steam version has crossplay and it's considered the final version. Has an Arcade port

One Must Fall

Diversions Entertainment

1993 (05/??)

MS-DOS

Floppy Disk

N/A

Indie

Freeware

DOSBox-X

N/A

Demo

Parsec

N/A

The first alpha version of OMF started as a demo with only two human characters. OMF2097 is considered the first real game and it's not a “sequel” of this. The demo is surprisingly playable and had some cult following thanks to shareware discs included in game magazines

One Must Fall: 2097

Diversions Entertainment

1994 (10/10)

MS-DOS

Win (unofficial)

Retail

Freeware

DOSBox-X / OpenOMF

N/A

2.1

Parsec / Original game netcode (OpenOMF)

X-BoT's OMF Universe (Archive.org backup)

OMF2097 Wiki

1v1 2D fighter with robots. Considered as one of the best MS-DOS fighting games made in the west. Declared freeware in 1999. Still has a small but faithful scene. Has an open source port called OpenOMF that runs the game on modern Windows OS and has rollback netcode

One Must Fall: Battlegrounds

Diversions Entertainment

2003 (12/19)

Windows

N/A

Retail

Commercial

N/A

Ver 2.172

Original game netcode

N/A

Sequel to OMF2097 that jumped to 3D arena gameplay and was megahated by the community. Use DXWnd and check "Hook dinput" or it may not register some keyboard input, also you will need to crack it even if you have an original CD. Online via direct IP. Barely a fighter

One Piece: Burning Blood

ワンピースバーニングブラッド

Spike Chunsoft

2016 (04/21)

PlayStation 4, PlayStation Vita

Blu Ray (PS4), Game Card (Vita)

Xbox One, Steam

Retail

Commercial

Vita3k (PSV)

N/A

Parsec / Steam Remote (2 players), original game netcode (4 players)

Complete moveset guide (YouTube)

3v3 3D arena fighter. Had an almost unnoticed reception and reviews were mediocre at best. 2 players local splitscreen and 4 players online. Shitty netcode so maybe Parsec or Steam Remote will be a better choice for 2 players. PSV port works on Vita3k albeit 1 player only

One Piece: Dai Kaizoku Colosseum

ワンピース大海賊闘技場

Arc System Works

2016 (09/21)

Nintendo 3DS

Game Card

N/A

Retail

Commercial

Citra

N/A

1.1.0

Citra

Mizuumi

Japan only ratio based 2.5D fighter with assist. Very cool anime fighter that has an active scene in Japan and the US. Mizuumi wiki is not good but the Discord community will help you. Save file is essential but it's hard to find (which doesn’t make any fucking sense)

One Piece: Gear Spirit

ワンピースギアスピリット

Matrix Software

2007 (08/30)

Nintendo DS

Game Card

N/A

Retail

Commercial

melonDS

N/A

Parsec (use two to four instances of the emulator opened)

N/A

4 players 2.5D platform fighter with cards that affect your character status. Save file with every character and cards unlocked available at GameFAQs (but no guide). Playable on emulators yet the use of cards via the touchscreen could be a little annoying

One Piece: Gigant Battle!

ワンピースギガントバトル!

Ganbarion

2010 (09/09)

Nintendo DS

Game Card

N/A

Retail

Commercial

melonDS

One Piece: Gigant Battle! 2 Shin Sekai

N/A

Parsec (use two to four instances of the emulator opened)

4 players 2D platform fighter with assists developed by the same team that made Jump Super/Ultimate Stars. Cool 2D spritework. 20 characters. Save file with everything unlocked available at GameFAQs

One Piece: Gigant Battle! 2 Shin Sekai

ワンピースギガントバトル! 2 新世界

Ganbarion

2011 (11/17)

Nintendo DS

Game Card

N/A

Retail

Commercial

melonDS

N/A

Parsec (use two to four instances of the emulator opened)

Update and final entry. 39 characters and over 100 assists. Save file with everything unlocked available at GameFAQs. Fun fact: the sprites of this title were used for the MUGEN fangame “One Piece Fighting Adventure” that I strongly recommend to give it a try

One Piece: Grand Adventure

Ganbarion

2006 (08/30)

Gamecube, PlayStation 2

Gamecube Game Disc, DVD (PS2)

N/A

Retail

Commercial

Dolphin (GC), PCSX2 (PS2)

N/A

Dolphin (GC), Parsec (PS2)

N/A

Fifth entry in the Grand Battle series, released exclusively for the western market. Final update for the GC/PS2 engine. Save file for both platforms available at GameFAQs. Series continues with the (barely) sequel “One Piece: Super Grand Battle! X”

One Piece: Grand Battle! 3

ワンピースグランドバトル! 3

Ganbarion

2003 (12/11)

Gamecube, PlayStation 2

Gamecube Game Disc, DVD (PS2)

N/A

Retail

Commercial

Dolphin (GC), PCSX2 (PS2)

One Piece: Grand Adventure

N/A

Dolphin (GC), Parsec (PS2)

Third entry in the Grand Battle series that follows “From TV Animation One Piece: Grand Battle! 2” but now totally made from scratch, jumped to GC/PS2 and has full 3D gameplay. Save file for both platforms available at GameFAQs. Sequel is “Grand Battle! Rush”

One Piece: Grand Battle! Rush

ワンピースグラバト! RUSH (One Piece Gurabato Rush)

Ganbarion

2005 (03/17)

Gamecube, PlayStation 2

Gamecube Game Disc, DVD (PS2)

N/A

Retail

Commercial

Dolphin (GC), PCSX2 (PS2)

One Piece: Grand Adventure

N/A

Dolphin (GC), Parsec (PS2)

Fourth entry. Was released in the US as “One Piece Grand Battle” just like the first PS1 game but because the US came late to the party compared to Japan/Europe I will use the japanese name. Update with more stuff. Save file @ GameFAQs. Sequel is “Grand Adventure”

One Piece: Super Grand Battle! X

ワンピース超グランドバトル X (One Piece Chou Grand Battle X)

Ganbarion

2014 (11/13)

Nintendo 3DS

Game Card

N/A

Retail

Commercial

Citra

N/A

Citra

N/A

Sixth and final entry in the Grand Battle series. This time the gameplay goes back to the PS1 Grand Battle 2.5D platform fighter style and supports 4 players. Has an english fantranslation. Save file is NOT on GameFAQs, but it's moderately easy to find elsewhere

One Punch Man: A Hero Nobody Knows

Spike Chunsoft

2020 (02/27)

PlayStation 4, Xbox One, Steam

Blu Ray (PS4, Xbox One), Download (Steam)

N/A

Retail

Commercial

N/A

1001

Parsec / Steam Remote / Original game netcode?

N/A

3v3 3D arena fighter based on the manga/anime. Reception was meh. Online seems to be bad? (haven’t tested myself, need more info). Has DLC if you want all the characters

One Strike

Retro Reactor

2017 (11/03)

Windows, Mac OS

Download (Steam)

N/A

Indie

Commercial

N/A

2020/01/09 patch

Parsec / Steam Remote

Steam guide

1v1 2D weapon based “one-hit-kill” fighter with retro-style spritework. Overall fun game, also the soundtrack slaps. No online

Oneachanchan

おねえちゃんちゃん (it reads “OneEchanchan” but the dev uses “OneA” instead)

Daromeon

2016 (unreleased)

Windows

Download (zip file)

N/A

Doujin

Freeware

N/A

ver-agevo

LilithPort / Parsec

N/A

2D Fighter Maker 2nd game. 1v1 2D fighter with bizarre characters designed by Daromeon, well known for his manga/anime “Kengan Ashua”. Playable demo with two characters released on Evo 2016, and has been totally radio silent since them. Killscreen article

Oni Fight

おにふぁい

Kotatsuaisu

2024 (07/04)

Windows

Download (zip file)

N/A

Doujin

Commercial

N/A

Oni Fight -New Ender-

N/A

LilithPort / Parsec

N/A

2D Fighter Maker 2nd game. 1v1 2D fighter based on the manga/anime “Onii-chan wa Oshimai!”. Digital copy on sale at DLSite

Oni Fight -New Ender-

おにふぁい~New Ender~

Kotatsuaisu

2024 (09/23)

Windows

Download (zip file)

N/A

Doujin

Commercial

N/A

LilithPort / Parsec

N/A

Update that added three new characters. Had a side tournament at Evo Japan 2025 (that, on a fun note, was won by the creator of the game lol). Digital copy on sale at DLSite

Onimusha: Blade Warriors

鬼武者無頼伝 (Onimusha Buraiden)

Capcom

2003 (11/27)

PlayStation 2

DVD

N/A

Retail

Commercial

PCSX2

N/A

Parsec

4 players 2.5D platform fighter. Spinoff of Onimusha. It's… serviceable, I guess. Has some unexpected guest characters from Mega Man. Save file with all characters unlocked available at GameFAQs

Onita Atsushi FMW

大仁田厚 FMW

Pony Canyon

1993 (08/06)

Super Nintendo

Cartridge (12MBit)

N/A

Retail

Commercial

Ares

N/A

Fightcade / Mednafen / RetroArch

N/A

1v1 2D fighter with a wrestling theme based on the real life wrestler Atsushi Onita. Seems to be a wrestling game at first but it plays more like SFII, with the gameplay concentrated on grabs and stage hazards. It's… unique to say the least

Origin of Storms

ArcForged

2027 (in development)

Windows

Download (Steam, Itch.io)

N/A

Indie

Commercial

N/A

Prototype demo

Parsec

N/A

1v1 2D fighter with a fantasy medieval setting. Gameplay tries to combine the combo system of the Marvel VS series with the beast transformations of Bloody Roar. Has a prototype demo with two characters and stages. No online (the dev recommends Parsec on the website)

Original Story from Fairy Tail: Gekitotsu! Kardia Daiseidou

Original story from FAIRY TAIL 激突!カルディア大聖堂

Hudson / Konami

2011 (04/21)

Nintendo DS

Game Card

N/A

Retail

Commercial

melonDS

N/A

Parsec (use two to four instances of the emulator opened)

N/A

4 players 2D platform fighter based on the anime of the same name. There’s no save file at GameFAQs and I haven’t found it anywhere, so if you have it please contact me

OSP Complete Archive

Exequor Studios

2018 (??/??)

MS-DOS

Download (zip file)

N/A

Retail

Commercial

DOSBox-X

N/A

Parsec

See entries on the respective games

Compilation that includes the MS-DOS fighting games “Champions of Zulula” and “Champions of Zulula: Elite Edition” by OSP Entertainment. The compilation runs on DOSBox

Osu!! Karatebu

押忍!! 空手部

Culture Brain

1994 (08/26)

Super Nintendo

Cartridge (20MBit)

N/A

Retail

Commercial

Ares

N/A

Fightcade / Mednafen / RetroArch

N/A

Also known as “Ossu!! Karate-bu” (both reads are correct). 1v1 2D fighter based on the manga/anime of the same name. Has some unique stuff like boxing-style count when you’re knockout. It's decent, wish it was more combo friendly

Otoko Matsuri

男祭

Chesire-cat

2000 (??/??)

Windows

Download (various zip files)

N/A

Doujin

Freeware

N/A

Ver.0.27b

Parsec

N/A

2D Fighter Maker 95 game. 1v1 2D fighter with two bizarre characters. Download was divided in five zip files, all saved by Archive.org (lucky!). Abandoned around 2001 (by reading the “about me” site I have the impression that the dev maybe passed away many years ago)

Otoko Retsuden

男列伝

Devil Aniki

Unknown (before 2002?)

Windows

Download (exe file)

N/A

Doujin

Freeware

N/A

Parsec

N/A

2D Fighter Maker 95 game. 1v1 2D fighter with an “evil, strange and dark men” cast and with a very obscure color palette. Still available for direct download on the devs official website. Sequel/update is called “Masao Retsuden”

Otoko Retsuden III

男列伝III

Devil Aniki

2002 (??/??)

Windows

Download (exe file)

N/A

Doujin

Freeware

N/A

Otoko Retsuden III

N/A

Parsec

Vector entry

N/A

Third entry after “Masao Retsuden”. Update with more characters and stages, and the final entry in the 2DFM95 engine. Available for download at Vector

Otoko Retsuden IV Dash

男列伝IVダッシュ

Devil Aniki

2004 (06/03)

Windows

Download

N/A

Doujin

Commercial

N/A

LilithPort / Parsec

N/A

Sequel that jumped to 2DFM2nd and as a commercial product. 15 new characters made from scratch. Full game available for download at Vector but has a password and you need to pay 1000 yen in order to send the pass to your email. Has a demo. There’s no “vanilla” IV

Otoko tai Onna

男対女

Ring a Bell

2010 (02/18)

Windows

Download

N/A

Doujin

Commercial

N/A

LilithPort / Parsec

Online (NSFW website)

N/A

2D Fighter Maker 2nd game. 1v1 2D fighter with digitized actors in a salaryman setting. It's slightly NSFW but it's silly, more like a dumb joke than anything else. Had a demo and was on sale but it's not anymore and this is a hard one to find (the devs are still active though)

Otoko tai Onna 2: Skirt Mekuri VS Kinkeri

男対女２～スカートめくりVS金蹴り

Ring a Bell

2011 (11/25)

Windows

Download

N/A

Doujin

Commercial

N/A

LilithPort / Parsec

Online (NSFW website)

N/A

Sequel made from scratch with totally new characters and stages, still in the live action salaryman setting. Silly NSFW stuff again. Same story with the demo and the full game so good luck trying to find those games

Otome X Senti

オトメXセンチ

Unikurage

2006 (08/13)

Windows

N/A

Doujin

Freeware

N/A

Ver3.1

Parsec

N/A

Spiritual sequel to “Anna vs Sentimental Fighter” but now as a crossover between “Mai-Otome HiME” and “Sentimental Graffiti”, developed with an original engine. Has a (now pointless) demo. Jumped to freeware status in 2020. Available for download at the dev’s Wixsite

Otvetnyy Udar

Ответный Удар

Comulti Multimedia

2003 (??/??)

Windows

N/A

Indie

Commercial

N/A

Parsec

N/A

2 players 3D arena fighter developed in Russia with a third person view, using animals and supposedly made for a pre-school audience. According to old-games.ru this game is “of unprecedented rarity” and trying to find an original copy is close to impossible, so just pirate it

Outer Dimension

GOMA

Unknown (in development)

Windows

Download (zip file)

N/A

Indie

Freeware

N/A

Beta 0.3.5

Parsec

See official website

MUGEN game. 1v1 2D fighter with original characters and assist creatures that feels very Digimon-esque. Gameplay inspired in “Arcana Heart” with a homing button. Looks like a japanese game but it’s made by a single taiwanese dev. Still in beta. Fun and VERY promising

Outfoxies, The

アウトフォクシーズ (Outfoxies)

Namco

1995 (03/??)

Arcade (Namco NB-2)

ROM board

Switch, Switch 2, PS4, PS5, Xbox Series X/S

Retail

Commercial

MAME

N/A

Retrobuda (Arkadyzja)

N/A

1v1 2D platform fighter… in fact it could be the very first of this kind. Feels like a spinoff of “Rolling Thunder” with a much more crazy action/item oriented versus gameplay. It's on Arkadyzja with rollback. It was finally ported to modern platforms in 2025 (no Steam though)

Outlaws of the Lost Dynasty

水滸演武 (Suiko Enbu)

Data East

1995 (03/14)

Arcade (ST-V)

Cartridge

SS, PS1, PS3, PSP

Retail

Commercial

MAME (Arcade), Mednafen (SS), Duckstation / Mednafen (PS1)

Suiko Enbu: Fūun Saiki

Japanese PS1 port

Arkadyzja (Arcade), Mednafen (SS), Duckstation Netplay / Arkadyzja (PS1)

1v1 2D weapon based fighter made by “Karnov’s Revenge” staff. JPN SS port is terrible, US SS port was released as “Dark Legend” and it's slightly better. PS1 port is the latest, has Mizoguchi, Yungmie and the “Special” mode. Has an update called “Suiko Enbu: Fūun Saiki”

Overkill

ID Interactive

1996 (??/??)

MS-DOS

N/A

Retail

Commercial

DOSBox-X

N/A

Parsec

N/A

Not to be confused with the MS-DOS shoot ‘em up game of the same name. 1v1 2D fighter with a futuristic setting using 3D prerender models. It's bad

Override 2: Super Mech League

Modus Studios Brazil

2020 (12/22)

Steam, Xbox One, Series X/S, PlayStation 4/5, Switch

Download (Steam), Blu Ray (PS4/5, Xbox One/Series X/S), Game Card (Switch)

N/A

Retail

Commercial

Yuzu/Ryujinx (Switch)

N/A

Original game netcode

N/A

Sequel/update developed by another team that changed a lot, especially the gameplay. Reception of this sequel has been mostly negative. At least this one is still available on Steam. Has a demo

Override: Mech City Brawl

The Balance Inc

2018 (08/10)

Steam, Xbox One, PlayStation 4

Download (Steam), Blu Ray (Xbox One, PS4)

Switch

Retail

Commercial

Yuzu/Ryujinx (Switch)

Override 2: Super Mech League

2019/04/12 patch

Original game netcode

N/A

4 players 3D arena fighter with mechas. The game was delisted from Steam and console digital marketplaces so the only way to play it legally is via console physical copies. The only way to play the Steam version now is via piracy

Ozkim Fight

オッツ・キイムファイト

Yuki

2012 (09/28)

Windows

Download (zip file)

N/A

Doujin

Commercial

N/A

LilithPort / Parsec