Crossover Quickies; just quick title mashes to put some series out there.
Marathon & Metal Gear
Armored Core & Metal Gear
Naruto & Shining Tears
Star Wars & Marathon
Marathon & Mass Effect
Marathon & Demon's Souls
Demon's Souls & Armored Core ( Ostrava/Otzdarva focus)
AC: Formula Front & Pokémon
Castle Crashers & Dark Souls (each knight is replaced with a DS char; Solaire, Lautrec, etc)
Hyper realistic Kingdom Hearts RE
Marathon & Star Wars Bounty Hunter
Crisis Core & Shining Tears (what if Zack had the twin dragon rings after the nibelheim incident)
Star Wars (what if the bounty hunter lineup in episode V included famous bounty hunters from across fiction)
BtVS & Marathon (Xander wakes up from stasis aboard the UESC Marathon)
Marathon (anything Durandal X Mjolnir Recon 54. Tsundere Durandal!)
Durarara & literally anything
Berserk & Dark Souls
Fallout (3, 4, New Vegas) & Marathon
Haydee & Portal
Half Life & Marathon Infinity
LoZ & Shadow of the Colossus
Spyro & Pokémon
Metroid & Marathon
Halo Wars & Marathon
Doctor Who & Dark Souls
Armored Core 2 & Red Faction
Marathon & Aliens
Doctor Who & Rama
Doctor Who & Steel Beach
Marathon & Steel Beach
Left 4 Dead & The Walking Dead
Shining Tears & Dragon's Dogma
Demon's Souls & Dragon's Dogma
Dark Souls & Infinity Blade
Fullmetal Alchemist & Demon's Souls
BloodBorne & Doctor Who
BloodBorne & SteamBoy
BloodBorne & Silent Hill
Metal Gear & Deus Ex
Republic Commando & Halo 3: ODST
Fable (just the first game) & FF7
Fable (just the second game) & Dark Souls (take the Oscar and put them in the Hero of Bowerstone's place. Focus on the elements of the game involving shadow)
Gears of War & Borderlands (just the first game)
KoToR & FF
Undertale & Silent Hill
Armored Core 4 (focus on the national dismantlement war)
Fable & Game of Thrones (Jack of Blades in Westeros)
Berserk & Any (Guts Vs The World)
Demon's Souls & Naruto (I want to see Naruto struggle to carry the DBS around Boletaria)
Tokyo Mew Mew & Kingdom Hearts
Destiny & Marathon
Marathon & Halo
Freeman's Mind & Any (Across the Universe, Baby!)
Warframe & Armored Core
Warframe & Metal Gear
Warframe & Marathon
Titanfall & Marathon
Titanfall & Warframe
Warframe & BloodBorne
Warframe & Starfox
Starfox & Marathon
Armored Core & Starfox
Oblivion & Naruto
Star Wars & Any (I want you to randomly interject Clone Troopers into other fictions, completely nonsensically. Like, they are displaced from their platoon and just appear where ever)
Undertale & Fallout
Durarara & Akira