First-party Crossovers
This includes games in which the crossovers are within the same company.
- Alex Kidd in Shinobi World (Alex Kidd and Shinobi characters)
- Aggressors of Dark Kombat (Fuuma from World Heroes series)
- Anarchy Reigns (Bayonetta and several characters from MadWorld)
- Anna Kournikova's Smash Court Tennis (various Namco characters, including Richard Miller from Time Crisis, Heihachi Mishima and Yoshimitsu from the Tekken series, Reiko Nagase, and Pac-Man)
- Art of Fighting 2 (Geese Howard from Fatal Fury series)
- Asura's Wrath (In a DLC Asura fights Ryu from Street Fighter)
- Bad Dudes (Karnov)
- Binding of Isaac (Characters from Gish and Time Fcuk)
- Blizzard All-Stars (Characters featured in games developed by Blizzard)
- Breath of Fire (Chun-Li)
- Cannon Spike (Capcom characters)
- Capcom Fighting Jam
- Captain Rainbow (various Nintendo characters)
- Civ II: Fantastic Worlds (Scenarios based on other MicroProse games such as Master of Magic, Master of Orion and X-Com)
- ClayFighter 63⅓ (You can play as Earthworm Jim and Boogerman)
- Cthulhu Saves the World (Characters from Breath of Death VII and Molly the Were-Zompire)
- Dead or Alive (series) (Ryu Hayabusa)
- Dead Rising (You can find a Mega Man buster and suit)
- Dead Rising 2 (You can find Sir Arthurs armor from Ghosts'n Goblins)
- Dead Rising 2: Off the Record (You can find Protomans suit from Mega Man)
- Dissidia Final Fantasy
- Ehrgeiz (various characters from Final Fantasy VII including Cloud, Tifa, Sephiroth, etc.)
- Everybody's Golf series (various PlayStation characters)
- Everybody's Tennis Portable (A Helghast soldier from Killzone)
- Famicom Wars (Samus Aran)
- Fatal Fury Special (Ryo Sakazaki from Art of Fighting)
- Fighter's History (Karnov)
- Fighters Megamix (Sega characters)
- The King of Fighters series (Fatal Fury, Art of Fighting, Psycho Soldier, Ikari Warriors, Buriki One, Savage Reign, Metal Slug and Samurai Shodown)
- Konami Krazy Racers (Metal Gear, Pop'n Music, Legend of the Mystical Ninja, Twinbee among others)
- Kirby Super Star (Various Nintendo characters is sitting in the audience during the Megaton Punch mini game)
- The Legend of Zelda: Link's Awakening (Contains reference to many various Nintendo games, and several enemies from the Mario (series))
- Naruto Shippuden: Ultimate Ninja Storm 2 (Lars Alexandersson from the Tekken series)
- Ninja Gaiden (Ayane)
- New International Track & Field (Various Konami characters)
- Onimusha Blade Warriors (MegaMan.EXE and Zero)
- Penny Arcade Adventures: Episode 3 (Cthulhu Saves the World and Molly the Were-Zompire)
- PlayStation All-Stars Battle Royale (various Sony characters such as Kratos, PaRappa, Sweet Tooth, and Sly Cooper).
- PlayStation Move Heroes (crossover of the Ratchet & Clank, Jak and Daxter and Sly Cooper franchises)
- Psi-Ops: The Mindgate Conspiracy (Scorpion from Mortal Kombat)
- Punch-Out!! (Wii) (Donkey Kong makes a cameo as a boss)
- Quake III Arena (Doom and Quake)
- Rival Schools: United by Fate (Sakura Kasugano)
- Rock n' Roll Racing (Olaf from The Lost Vikings)
- Samurai Warriors (Lu Bu of Dynasty Warriors makes an appearance as a hidden boss)
- Saturday Night Slam Masters (Mike Haggar from Final Fight)
- Secret of Mana (Moogles from the Final Fantasy games)
- Sega SuperStars
- Sega Superstars Tennis
- Segagaga
- Seiken Densetsu 3 (Moogles from the Final Fantasy games)
- Shin Megami Tensei: Nocturne (Dante from Devil May Cry)
- SNK Gals' Fighters (Several female characters from SNK games)
- Solomon's Key (Mighty Bomb Jack)
- Soulcalibur II (Heihachi Mishima from Tekken)
- Soulcalibur Legends (Lloyd Irving from Tales of Symphonia)
- Star Ocean series (Lenneth Valkyrie and Freya from the Valkyrie Profile series. Many tri-Ace games also feature crossover secret bosses and the like.)
- Street Fighter Alpha series (tie-in with Final Fight)
- Street Fighter X Mega Man (A crossover between Street Fighter and Mega Man)
- Super Gem Fighter Mini Mix (Street Fighter, Darkstalkers and Red Earth)
- Super Mario RPG: Legend of the Seven Stars (Link and Samus both make cameos)
- Super Puzzle Fighter II Turbo (Various characters from Capcom fighting games)
- Super Smash Bros. series (various Nintendo characters including Mario, Donkey Kong, Link, Pikachu, etc.)
- Tales series (some games feature crossovers from other Tales of timelines {i.e. Lloyd Irving in Tales of Symphonia}, as well as sometimes featuring characters from other Namco series)
- Tecmo Super Bowl (Mighty Bomb Jack)
- Tony Hawk's Project 8 (Grim Ripper from the Guitar Hero series)
- Tony Hawk's Proving Ground (Judy Nails from Guitar Hero)
- Urban Reign (Paul Phoenix and Marshall Law)
- Venus & Braves (Multiple Tales series characters on the PSP remake)
- Viewtiful Joe (Dante from Devil May Cry makes an appearance in the PlayStation 2 version)
- Warriors Orochi (Dynasty Warriors, Samurai Warriors)
- We Love Golf! (Assorted Capcom characters)
- World of Warcraft (The main characters from The Lost Vikings makes an appearance in the game)
Read more about this topic: Fictional Crossovers In Video Games